市场调查报告书
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1601795
航太和国防轮与煞车市场 - 全球产业规模、份额、趋势、机会和预测,按飞机类型、产品类型、最终用途、地区和竞争细分,2019-2029 年Aerospace and Defense Wheel & Brake Market - Global Industry Size, Share, Trends, Opportunity, and Forecast, Segmented By Aircraft Type, By Product Type, By End Use, By Region & Competition, 2019-2029F |
2023 年,全球航太航太和国防车轮与煞车市场价值为 74.4 亿美元,预计到 2029 年将达到 107.3 亿美元,到 2029 年复合年增长率为 6.35%。特征的行业,可确保最高的安全和性能标准。儘管由于全球 COVID-19 大流行而面临暂时的挫折,但在技术进步和对商用和军用新飞机的需求不断增长的推动下,该行业有望復苏和增长。
市场概况 | |
---|---|
预测期 | 2025-2029 |
2023 年市场规模 | 74.4亿美元 |
2029 年市场规模 | 107.3亿美元 |
2024-2029 年复合年增长率 | 6.35% |
成长最快的细分市场 | 通用飞机 |
最大的市场 | 北美洲 |
航空旅行的增加,特别是在新兴经济体,导致对新飞机的需求激增,从而推动了航太轮和煞车市场的成长。该部门不仅涉及新系统的生产,还涉及现有机队的维护、修理和大修(MRO),这对于确保安全和延长航空资产的生命週期至关重要。
在碳复合材料等材料科学创新的帮助下,人们非常重视轻量且更有效率的煞车系统的开发。与传统钢製煞车相比,这些新材料具有更好的性能和更长的使用寿命,从而降低了航空公司的整体营运成本。从竞争格局来看,市场的特征是既有成熟企业,也有颠覆性的新进者。霍尼韦尔国际公司 (Honeywell International)、赛峰起落架系统公司 (Safran Landing Systems) 和美捷特 PLC (Meggitt PLC) 等主要厂商占据市场主导地位,提供全面的车轮和煞车系统。技术进步也推动了竞争,各公司都在激烈竞争,以提供不仅安全可靠、而且经济高效且易于维护的系统。
政府法规和政策对于塑造航太和国防工业至关重要,特别是在飞机机轮和煞车领域。这些组件经过严格的认证流程,以满足美国联邦航空管理局 (FAA) 和欧洲欧盟航空安全局 (EASA) 等机构制定的严格安全标准。
该行业的一个重要趋势是越来越重视永续性。人们共同努力采用环保做法,推动替代材料和技术的进步。例如,正在开发再生煞车系统以增强永续性。这些系统在着陆过程中捕获飞机的动能并将其转换为可用的电能,有助于减少对环境的影响。
该研究进一步强调了航空运输业的扩张,反映出航空业的强劲前景。这一成长凸显了该产业巨大的经济影响力,占全球 GDP 的 3.5%,约 2.7 兆美元。此外,该产业还在全球创造了 6,500 万个就业岗位,强化了其在全球经济中的关键作用,及其对经济发展和创造就业的持续贡献。
随着航空公司寻求优化现有机队的性能和可靠性,该市场也为售后服务提供了机会。这包括用更新、更有效率的机轮和煞车系统改造旧飞机。在国防部门,市场受到持续的机队现代化计划以及世界各地军队采购先进战斗机和运输机的推动。该领域还需要客製化解决方案,以满足从战斗机到重型货机等不同类型飞机的特定需求。
对飞机和机队扩张的需求不断增加
车轮和煞车系统的技术进步
强调燃油效率和环境永续性
商用航空售后市场的成长
严格的监管合规性和认证标准
飞机系统的复杂性不断增加
重量限制和燃油效率要求
成本压力与预算限制
整合先进材料以增强性能
飞机和线控制动系统的电气化
数位化和状态维护
永续实践与环保解决方案
全球扩张和策略合作伙伴关係
飞机类型见解
区域洞察
Global Aerospace and Defense Wheel & Brake Market was valued at USD 7.44 billion in 2023 and is projected to reach USD 10.73 billion by 2029 growing with a CAGR of 6.35% through 2029. The Aerospace and Defense Wheel & Brake Market is a critical segment within the aviation industry, one characterized by constant innovation and stringent regulations that ensure the utmost safety and performance standards. Despite facing temporary setbacks due to the global COVID-19 pandemic, the sector is poised for recovery and growth, fueled by advancements in technology and increasing demands for new aircraft - both commercial and military.
Market Overview | |
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Forecast Period | 2025-2029 |
Market Size 2023 | USD 7.44 Billion |
Market Size 2029 | USD 10.73 Billion |
CAGR 2024-2029 | 6.35% |
Fastest Growing Segment | General Aircraft |
Largest Market | North America |
Increased air travel, particularly in emerging economies, has led to a surge in demand for new aircraft, subsequently driving growth in the aerospace wheel and brake market. This sector is not only concerned with the production of new systems but also with the maintenance, repair, and overhaul (MRO) of existing fleets, which is essential for ensuring safety and extending the lifecycle of aviation assets.
There has been a significant emphasis on the development of lightweight and more efficient brake systems, aided by innovations in materials science such as carbon composites. These new materials offer better performance and longer lifespans compared to traditional steel brakes, reducing the overall operational costs for airlines. In terms of competitive landscape, the market is characterized by a mix of well-established companies and disruptive new entrants. Key players like Honeywell International, Safran Landing Systems, and Meggitt PLC dominate the market, offering comprehensive wheel and brake systems. Competition is also driven by technological advancements, with companies fiercely competing to offer systems that are not only safe and reliable but also cost-efficient and easy to maintain.
Government regulations and policies are crucial in shaping the aerospace and defense industry, particularly in the realm of aircraft wheels and brakes. These components undergo rigorous certification processes to meet stringent safety standards established by authorities such as the Federal Aviation Administration (FAA) in the United States and the European Union Aviation Safety Agency (EASA) in Europe.
A significant trend within the industry is the increasing emphasis on sustainability. There is a concerted effort towards adopting environmentally friendly practices, driving advancements in alternative materials and technologies. For instance, regenerative braking systems are being developed to enhance sustainability. These systems capture and convert kinetic energy from the aircraft during landing into usable electrical energy, contributing to reduced environmental impact.
The study further underscores the expansion of the air transport sector, reflecting a robust outlook for aviation. This growth highlights the sector's considerable economic influence, representing 3.5% of global GDP, approximately USD2.7 trillion. Additionally, the industry has created 65 million jobs worldwide, reinforcing its critical role in the global economy and its ongoing contribution to economic development and job creation.
The market also presents opportunities for after-market services, as airlines seek to optimize the performance and reliability of their existing fleets. This includes retrofitting older aircraft with newer, more efficient wheel and brake systems. In the defense sector, the market is bolstered by ongoing fleet modernization programs and the procurement of advanced combat and transport aircraft by military forces around the world. This sector also demands customized solutions to meet the specific needs of different types of aircraft, from fighter jets to heavy-lift cargo planes.
Market Drivers
Increasing Demand for Aircraft and Fleet Expansion
A primary driver propelling the global aerospace and defense wheel and brake market is the escalating demand for commercial and military aircraft, leading to widespread fleet expansion. The burgeoning global population, rising disposable incomes, and increased urbanization have driven the demand for air travel, particularly in emerging economies. As airlines strive to meet this growing demand, they invest in the expansion and modernization of their fleets, creating a robust market for aerospace components, including wheels and brakes.
In the commercial aviation sector, long-term projections indicate a substantial increase in the number of passengers and cargo volumes, requiring additional aircraft to accommodate this surge. Similarly, military forces worldwide are undergoing modernization efforts, retiring aging fleets and acquiring new, technologically advanced aircraft. This demand for new aircraft directly influences the aerospace and defense wheel and brake market, as these components are crucial for the safe and efficient operation of every aircraft. According to the International Civil Aviation Organization (ICAO), the volume of global air traffic is notably high, with over 400 aircraft departing every hour solely from scheduled commercial flights. The aviation sector is experiencing rapid growth and is projected to continue expanding. Current forecasts indicate that the demand for air transport will increase at an average annual rate of 4.3% over the next two decades.
The expansion of the global aircraft fleet is not limited to commercial airliners but also encompasses various segments such as regional jets, business jets, military aircraft, and unmanned aerial vehicles (UAVs). Each of these segments contributes to the sustained demand for high-performance and technologically advanced wheels and brakes. Manufacturers in the aerospace and defense wheel and brake market are strategically positioned to capitalize on this trend, aligning their production capabilities with the requirements of both established and emerging aviation players.
Technological Advancements in Wheel and Brake Systems
Technological advancements in wheel and brake systems represent a significant driver pushing the aerospace and defense market forward. The industry is witnessing a continuous evolution in materials, design methodologies, and manufacturing processes, resulting in the development of more efficient, lightweight, and durable components.
Materials play a pivotal role in enhancing the performance of aerospace wheels and brakes. The shift towards advanced materials, such as carbon composites and titanium alloys, offers a substantial improvement in strength-to-weight ratios. Carbon composite materials, in particular, have gained prominence for their ability to reduce weight while maintaining structural integrity. This trend aligns with the overall goal of the aviation industry to improve fuel efficiency and reduce emissions.
The integration of smart technologies into wheel and brake systems has become a key driver. The emergence of sensor technologies, data analytics, and connectivity solutions has enabled real-time monitoring of these critical components. This not only facilitates predictive maintenance, reducing downtime and operational costs but also enhances overall safety and reliability.
In the military sector, technological advancements contribute to the development of high-performance braking systems for fighter jets and military transport aircraft. Enhanced braking capabilities are crucial for military operations, where rapid deceleration and short landing distances are often required. The aerospace and defense wheel and brake market's response to these technological advancements positions it at the forefront of innovation, catering to the evolving needs of both civil and military aviation.
Emphasis on Fuel Efficiency and Environmental Sustainability
The global emphasis on fuel efficiency and environmental sustainability is a compelling driver shaping the aerospace and defense wheel and brake market. The aviation industry, driven by regulatory pressures and environmental concerns, is actively seeking solutions to reduce fuel consumption, lower emissions, and minimize its overall environmental impact.
Wheels and brakes play a pivotal role in achieving these sustainability goals. The pursuit of fuel efficiency has led to the adoption of lightweight materials and innovative design approaches to reduce the overall weight of aircraft. Lighter wheels and brakes contribute directly to fuel savings by reducing the aircraft's operational weight, enhancing efficiency during takeoff, flight, and landing.
The integration of electric taxiing systems, where aircraft can move on the ground without using the main engines, contributes to fuel efficiency during ground operations. Electric taxiing systems leverage electric wheel motors, requiring advanced wheel and brake systems capable of seamlessly integrating with these innovative propulsion technologies.
In response to environmental regulations and societal expectations, aerospace and defense wheel and brake manufacturers are investing in research and development to create eco-friendly solutions. This includes the exploration of recyclable materials and sustainable manufacturing practices, aligning with the broader industry's commitment to environmental responsibility.
Growth in the Commercial Aviation Aftermarket
The growth of the commercial aviation aftermarket is a significant driver influencing the aerospace and defense wheel and brake market. As aircraft age, components, including wheels and brakes, require regular maintenance, repair, and replacement to ensure continued safe and reliable operations. The aftermarket segment, encompassing maintenance, repair, and overhaul (MRO) services, presents a lucrative avenue for manufacturers and service providers in the aerospace and defense wheel and brake market.
Aircraft operators, seeking cost-effective solutions for maintaining their fleets, often turn to aftermarket services to extend the operational life of components. This trend is particularly prevalent in the commercial aviation sector, where aging fleets and increasing air travel demand drive the need for comprehensive aftermarket support.
The aftermarket for wheels and brakes involves a range of services, from routine inspections and component repairs to complete overhauls and replacements. Manufacturers that offer efficient aftermarket support gain a competitive advantage, fostering long-term relationships with airline operators and positioning themselves as reliable partners throughout the entire lifecycle of the aircraft.
Advancements in predictive maintenance technologies contribute to the growth of the aftermarket. By leveraging data analytics, sensor technologies, and connectivity solutions, aerospace and defense wheel and brake manufacturers can offer proactive maintenance solutions, reducing unscheduled downtime and optimizing the overall cost of ownership for aircraft operators.
Key Market Challenges
Stringent Regulatory Compliance and Certification Standards
One of the primary challenges confronting the global aerospace and defense wheel and brake market is navigating the stringent regulatory compliance and certification standards set by aviation authorities worldwide. Entities such as the Federal Aviation Administration (FAA) in the United States, the European Union Aviation Safety Agency (EASA) in Europe, and other national regulatory bodies impose rigorous standards to ensure the safety, reliability, and performance of aerospace components, including wheels and brakes.
Meeting these standards requires manufacturers to undergo exhaustive testing and certification processes, which can be time-consuming and resource-intensive. The challenge lies not only in meeting current standards but also in anticipating and adapting to evolving regulatory requirements. Any deviation from these standards can lead to delays in product certification and market entry, potentially impacting the competitiveness of aerospace and defense wheel and brake manufacturers.
The international nature of the aerospace industry necessitates compliance with a diverse set of standards across different regions. This adds complexity to the development and certification processes, as manufacturers must navigate a landscape of varying regulatory frameworks.
The continuous evolution of aviation technology and the introduction of new materials further complicate the regulatory landscape. Manufacturers must stay abreast of changes in standards and invest in research and development to ensure their products comply with the latest requirements. Navigating the intricate web of regulatory compliance remains a persistent challenge in the aerospace and defense wheel and brake market.
Increasing Complexity of Aircraft Systems
The growing complexity of modern aircraft systems poses a substantial challenge to the aerospace and defense wheel and brake market. As aircraft designs become more advanced, incorporating cutting-edge avionics, electronic control systems, and innovative materials, the demands placed on landing gear components, including wheels and brakes, intensify.
Traditionally, landing gear systems have been relatively straightforward, comprising wheels, brakes, shock absorbers, and associated structural components. However, the integration of advanced technologies, such as electric and hybrid propulsion systems, distributed electric propulsion, and smart landing gear systems, presents new challenges for wheel and brake manufacturers.
Electric and hybrid aircraft, for instance, require landing gear components that can handle the specific demands of these propulsion systems, including regenerative braking and electrical power distribution. The development of smart landing gear systems involves the incorporation of sensors, actuators, and sophisticated control systems, adding layers of complexity to the overall design and functionality of wheels and brakes.
Adapting to the increasing complexity of aircraft systems requires continuous innovation in materials, manufacturing processes, and design methodologies. Manufacturers must strike a balance between providing components that are compatible with the latest aircraft technologies and ensuring ease of maintenance and operability. The challenge is to develop wheels and brakes that seamlessly integrate into diverse aircraft configurations, catering to both commercial and military platforms.
Weight Constraints and Fuel Efficiency Demands
Weight constraints and the relentless pursuit of fuel efficiency represent persistent challenges for the aerospace and defense wheel and brake market. Aircraft weight directly influences fuel consumption, operational costs, and environmental impact. As the industry strives to design and manufacture lighter aircraft to enhance fuel efficiency and reduce emissions, landing gear components, including wheels and brakes, face increasing pressure to contribute to weight savings without compromising safety and performance.
Traditional materials like steel and aluminum alloys have been the go-to choices for wheel and brake manufacturing, providing a balance of strength and weight. However, the demand for even lighter solutions has led to the exploration of advanced materials such as titanium alloys and composite materials. While these materials offer weight-saving advantages, they often come with higher production costs and manufacturing complexities.
Balancing the need for weight reduction with the requirement for robust and reliable landing gear components is a formidable challenge. The weight of wheels and brakes directly affects the overall weight distribution of the aircraft, impacting critical factors such as balance, stability, and aerodynamics. Manufacturers must explore innovative design approaches, advanced materials, and manufacturing techniques to optimize the weight of aerospace and defense wheels and brakes.
The pursuit of fuel efficiency extends beyond commercial aviation to military aircraft, where factors such as mission range, payload capacity, and deployment capabilities are critical. The challenge is to develop landing gear solutions that not only comply with stringent safety and performance standards but also contribute to the broader goal of improving the operational efficiency of aircraft.
Cost Pressures and Budgetary Constraints
Cost pressures and budgetary constraints pose significant challenges for the aerospace and defense wheel and brake market. The aerospace industry operates in a highly competitive environment, and manufacturers face intense scrutiny over the cost of components from both commercial airlines and military procurement agencies. Fluctuations in raw material prices, supply chain disruptions, and geopolitical factors can impact the cost of manufacturing aerospace and defense wheels and brakes. Additionally, the development of innovative materials and technologies, while offering advantages in terms of weight reduction and performance, often comes with higher production costs. Striking a balance between incorporating advanced technologies and meeting budgetary constraints requires a strategic approach to cost management throughout the entire product lifecycle.
Key Market Trends
Integration of Advanced Materials for Enhanced Performance
A significant trend in the global aerospace and defense wheel and brake market is the integration of advanced materials to enhance overall performance. Traditional materials like steel and aluminum alloys are being supplemented and, in some cases, replaced by innovative materials such as carbon composites, titanium, and advanced alloys. Carbon composite materials offer a favorable strength-to-weight ratio, making them ideal for lightweight applications without compromising structural integrity. Titanium alloys are recognized for their high strength, corrosion resistance, and reduced weight compared to steel, contributing to improved fuel efficiency and operational capabilities.
The integration of these advanced materials in the manufacturing of wheels and brakes aligns with the aerospace industry's pursuit of lightweight solutions. Lighter components reduce the overall weight of the aircraft, leading to fuel savings and increased payload capacity. As a result, manufacturers in the aerospace and defense wheel and brake market are investing in research and development to optimize the use of these materials and address the demanding performance requirements of modern aerospace platforms.
The shift towards advanced materials reflects the increasing complexity of aircraft design and the need for components that can withstand the challenges posed by higher operational demands. These materials offer enhanced durability, heat resistance, and fatigue strength, contributing to the reliability and longevity of aerospace and defense wheels and brakes.
Electrification of Aircraft and Brake-by-Wire Systems
The trend towards the electrification of aircraft, driven by the quest for greener and more sustainable aviation solutions, is influencing the aerospace and defense wheel and brake market. As industry explores electric and hybrid propulsion systems, traditional hydraulic brake systems are being reconsidered in favor of brake-by-wire (BBW) systems. BBW systems replace traditional hydraulic components with electronic controls, providing more precise and efficient control over the braking process.
In a brake-by-wire system, electronic signals are used to transmit braking commands, eliminating the need for direct mechanical linkage between the pilot's controls and the brakes. This allows for more flexible and customizable braking profiles, optimizing performance for different aircraft types and operational scenarios. The adoption of BBW systems contributes to weight reduction, increased reliability, and improved maintenance efficiency.
The integration of electric technologies extends beyond propulsion systems, with the development of electric taxiing systems. These systems leverage electric wheel motors to provide ground movement without the need for the main engines, reducing fuel consumption during taxiing. As electric and hybrid aircraft become more prevalent, the aerospace and defense wheel and brake market is witnessing a paradigm shift towards innovative systems that support these new propulsion technologies.
Digitalization and Condition-Based Maintenance
Digitalization and the implementation of condition-based maintenance (CBM) are becoming integral to the aerospace and defense wheel and brake market. With the advent of Industry 4.0 and the Internet of Things (IoT), manufacturers are incorporating sensors and data analytics into wheel and brake systems to enable real-time monitoring of component health. These smart technologies provide operators with actionable insights into the condition of wheels and brakes, allowing for proactive maintenance and minimizing unplanned downtime.
Sensors embedded in wheel and brake components collect data on parameters such as temperature, vibration, wear, and pressure. This data is transmitted to centralized monitoring systems, where advanced analytics algorithms assess the performance and predict potential issues. CBM enables operators to shift from scheduled maintenance practices to a more predictive and efficient model, optimizing the lifecycle management of aerospace and defense wheels and brakes.
The implementation of digitalization and CBM not only enhances safety and reliability but also contributes to cost savings by reducing the need for routine, time-based maintenance. Manufacturers are leveraging these technologies to offer smart, connected solutions that meet the evolving demands of aircraft operators seeking enhanced performance and operational efficiency.
Sustainable Practices and Environmentally Friendly Solutions
Sustainability has emerged as a prominent trend in the aerospace and defense wheel and brake market, reflecting the broader industry's commitment to environmental responsibility. Manufacturers are increasingly focused on adopting sustainable practices in the production of wheels and brakes, encompassing both materials and manufacturing processes.
The use of recyclable materials and eco-friendly manufacturing processes is gaining traction. Manufacturers are exploring alternative materials that have minimal environmental impact and can be recycled at the end of a component's life cycle. This aligns with the industry's broader goal of embracing circular economy principles and reducing the environmental footprint of aerospace components.
Sustainable practices extend beyond the manufacturing phase to address end-of-life considerations. Manufacturers are developing solutions for recycling and repurposing aerospace and defense wheels and brakes, minimizing waste and contributing to a more sustainable industry. This trend responds to the increasing awareness and demands from both regulators and customers for environmentally friendly aerospace solutions.
Global Expansion and Strategic Partnerships
The aerospace and defense wheel and brake market are witnessing a trend towards global expansion and strategic partnerships among key industry players. Manufacturers are increasingly seeking opportunities to expand their presence in emerging aerospace markets, capitalizing on the growing demand for new aircraft and associated components. Strategic partnerships, collaborations, and joint ventures are becoming prevalent as companies aim to leverage each other's strengths and capabilities. For instance, In June 2024, Avianca, a major Colombian airline, chose Collins Aerospace, a unit of RTX, to supply wheels and brakes for its upcoming fleet of 103 A320neo aircraft over the next 15 years. Collins currently provides wheels and brakes for Avianca's existing A320ceo and A320neo aircraft. The brakes from Collins are equipped with DURACARB carbon friction material, which delivers a longer brake life compared to competitors. This results in reduced maintenance needs, fewer service disruptions, increased savings, and enhanced operational efficiency.
Global expansion allows manufacturers to tap into new customer bases, diversify their product portfolios, and establish a more robust supply chain. It also enables them to address specific regional requirements and comply with varying regulatory standards. In addition, strategic partnerships facilitate knowledge sharing and technological exchange, fostering innovation in wheel and brake design and manufacturing.
Segmental Insights
Aircraft Type Insights
The general aircraft is emerging as the fastest-growing segment within the Global Aerospace and Defense Wheel & Brake Market. This growth is driven by the increasing demand for private and business jets, coupled with a resurgence in general aviation activities worldwide. Advancements in technology and design are enhancing the performance and safety of aircraft wheels and brakes, contributing to the market's expansion.
Several factors are propelling this growth, including rising disposable incomes, which are encouraging more individuals and businesses to invest in private aircraft. Additionally, the expansion of general aviation fleets and increased flight operations in emerging markets are further boosting demand for advanced wheel and brake systems.
Manufacturers are responding by innovating to improve efficiency, durability, and safety features of their products, which aligns with the growing needs of the general aviation industry. This dynamic segment is expected to continue its rapid expansion, driven by technological advancements, increasing global air travel, and a growing emphasis on enhanced aircraft performance and safety standards.
Regional Insights
North America holds a dominant position in the Global Aerospace and Defense Wheel & Brake Market due to its extensive aerospace industry and robust defense sector. The region's leadership is attributed to several key factors, including the presence of major aerospace manufacturers and defense contractors, such as Boeing and Lockheed Martin. These companies drive significant demand for advanced wheel and brake systems, supporting North America's market dominance. The region benefits from a well-established infrastructure and a high level of investment in research and development, fostering innovation in wheel and brake technologies. Additionally, North America's strong defense budget ensures continued procurement of state-of-the-art equipment, further solidifying its market leadership.
The growth of commercial aviation in the U.S. and Canada, coupled with increasing demand for both military and civilian aircraft, contributes to the high demand for wheel and brake systems. The strategic importance of the aerospace and defense sectors in North America, along with favorable government policies and defense contracts, reinforces its leading position in the global market. Consequently, North America remains a pivotal region in shaping the future of aerospace and defense wheel and brake technologies.
Meggitt PLC
Honeywell International Inc.
Parker Hannifin Corporation
Safran SA
RTX Corporation
The Boeing Company
Airbus SE
Bombardier Inc.
Embraer S.A.
Heroux-Devtek Inc.
In this report, the Global Aerospace and Defense Wheel & Brake Market has been segmented into the following categories, in addition to the industry trends which have also been detailed below:
Aerospace and Defense Wheel & Brake Market, By Aircraft Type:
Aerospace and Defense Wheel & Brake Market, By Product Type:
Aerospace and Defense Wheel & Brake Market, By End Use:
Aerospace and Defense Wheel & Brake Market, By Region:
Company Profiles: Detailed analysis of the major companies present in the Global Aerospace and Defense Wheel & Brake Market.
Global Aerospace and Defense Wheel & Brake market report with the given market data, TechSci Research offers customizations according to a company's specific needs. The following customization options are available for the report:
Detailed analysis and profiling of additional market players (up to five).