Spirit AeroSystems

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A major aerospace manufacturer specializing in large aircraft structures and aerostructure assemblies.

Last updated November 4, 2026

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First read: Nov 4, 2026
Latest read: Nov 4, 2026

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Overview

Spirit AeroSystems is a United States aerospace manufacturer specializing in large structural assemblies for commercial aircraft, business aircraft, defense platforms, and space programs. Its products include fuselage sections, flight-deck structures, wings, wing spars, pylons, engine nacelles, composite assemblies, and other aerostructures supplied to aircraft manufacturers and major aerospace contractors. The company has historically been one of the largest independent suppliers in the aerostructures sector and has been especially important to Boeing’s commercial-aircraft production system. The company was created in 2005 when Boeing sold its Wichita, Kansas, aircraft-manufacturing division and related facilities in Oklahoma to Onex Corporation. The transaction was part of Boeing’s effort to divest manufacturing assets and improve capital efficiency. The new business initially operated as Mid-Western Aircraft Systems and was renamed Spirit AeroSystems several months later. Its Wichita heritage stretches back to Stearman Aircraft, founded at the site in 1927. After becoming part of Boeing, the facility produced major military and commercial aircraft structures, including components for the B-29 Superfortress, B-47 Stratojet, B-52 Stratofortress, and later Boeing commercial aircraft. Spirit’s original business was heavily dependent on Boeing, particularly the 737 program and the manufacture of fuselage sections and forward fuselage or flight-deck structures for several Boeing aircraft. Under Onex, the company pursued diversification by acquiring or developing operations serving Airbus, Bombardier, business-jet manufacturers, and defense customers. In 2006 it acquired BAE Systems’ aerostructures operations in Prestwick and Samlesbury. It later established facilities in Malaysia and North Carolina, including a composites plant supporting Airbus A350 production. Spirit also won contracts for wings and other structures for Gulfstream aircraft. The company expanded further through the acquisition of Bombardier Aviation’s aerostructures and aftermarket activities in Belfast and Casablanca, completed in 2020, and through the purchase of Fiber Materials in 2020 and Applied Aerodynamics in 2021. These transactions broadened Spirit’s capabilities in composite materials, aircraft maintenance, repair and overhaul, business aviation, and defense and space applications. Its major programs included Boeing 737 and 787 fuselage structures, Airbus A350 fuselage sections, Airbus A220 wings and fuselage components, Airbus wing structures, Gulfstream business-jet wings, and structures for military aircraft such as the Sikorsky CH-53K. Spirit became a publicly traded company in 2006. Onex ultimately sold its remaining shares in 2014, ending its ownership period. Despite its large industrial footprint, Spirit later faced financial pressure, production disruptions, and criticism over manufacturing quality. The company became a central focus of scrutiny after the January 2024 Alaska Airlines Flight 1282 incident, in which a door plug separated from a Boeing 737 MAX 9 during flight. The relevant fuselage and door-plug work had been performed within Spirit’s manufacturing chain before final aircraft assembly by Boeing. Employees and legal filings also alleged broader quality-control failures, recordkeeping problems, retaliation, and pressure to conceal defects. In 2024 Boeing agreed to reacquire Spirit in an all-stock transaction valued at approximately $4.7 billion in equity value and approximately $8.3 billion including assumed debt. The transaction was designed to reunite Boeing with a supplier whose operations were deeply integrated into Boeing’s production system. Because Spirit also supplied Airbus, the parties arranged a concurrent transfer of specified Airbus-related assets and facilities directly to Airbus. The Airbus transaction covered operations in Kinston, Saint-Nazaire, Casablanca, Belfast, Prestwick, and selected Wichita activities,…

History

Spirit AeroSystems emerged from the restructuring of Boeing’s manufacturing portfolio in 2005. Boeing sold its Wichita division, together with facilities in Tulsa and McAlester, Oklahoma, to Onex Corporation. The new company was initially named Mid-Western Aircraft Systems and was renamed Spirit AeroSystems later that year. The Wichita operation had a long aerospace history: the site originated with Stearman Aircraft in 1927, became associated with United Aircraft and Transport Corporation, and was retained by Boeing after the 1934 breakup of that group. Boeing’s Wichita division later produced major military aircraft structures, including components for the B-29, B-47, and B-52. Spirit entered the market with a strong Boeing customer base, particularly in fuselage manufacturing. The Wichita operation became closely associated with the Boeing 737 fuselage and with forward fuselage and flight-deck structures for Boeing commercial aircraft. Onex sought to reduce Spirit’s dependence on Boeing by building a broader portfolio of Airbus, defense, business-aviation, and aftermarket work. In 2006 Spirit acquired BAE Systems’ aerostructures operations at Prestwick and Samlesbury. The acquired business supplied structures to Airbus, Boeing, and defense customers and gave Spirit a significant European manufacturing presence. The company continued international expansion during the following decade. It opened a facility in Subang, Malaysia, in 2009 and a composites plant in Kinston, North Carolina, in 2010. Kinston produced composite sections for the Airbus A350, which were transferred to Spirit’s Saint-Nazaire operation in France for further assembly before delivery to Airbus. Spirit also won contracts to produce wings for Gulfstream’s G280 and G650 business aircraft. In 2014 Onex sold its remaining interest in Spirit, ending the private-equity group’s ownership of the manufacturer. Spirit expanded again through acquisitions. In 2019 it agreed to purchase Bombardier Aviation’s aerostructures and aftermarket activities in Belfast and Casablanca; the transaction was completed in 2020. Belfast became associated with Airbus A220 wing and fuselage work, while Casablanca supported A220 components and other aerostructures. In 2020 Spirit also acquired Fiber Materials, a specialist in high-temperature materials and composites used primarily in defense and space applications. In 2021 it bought Applied Aerodynamics, a Dallas-based maintenance, repair and overhaul business. The expanded business remained exposed to the cyclicality and operational complexity of commercial-aircraft production. Spirit’s largest customers historically included Boeing and Airbus, with the Boeing relationship particularly dominant in its early years. Quality and production problems later generated substantial scrutiny. In late 2023, an employee lawsuit alleged that workers had raised concerns about systematic quality-control failures, defect reporting, record falsification, and retaliation. These allegations were not equivalent to a final judicial finding, but they contributed to a wider debate over the governance of outsourced aircraft manufacturing. The January 2024 Alaska Airlines Flight 1282 incident became a major turning point. A door plug separated from a Boeing 737 MAX 9 during flight, producing an uncontrolled decompression. Spirit manufactured and initially assembled the relevant fuselage and door-plug structure before shipment to Boeing for final aircraft assembly. The incident prompted investigations and renewed attention to the division of manufacturing responsibility, inspection practices, documentation, and supplier oversight. Boeing and Spirit subsequently began discussions about bringing the supplier back into Boeing ownership. In 2024 Boeing agreed to reacquire Spirit in an all-stock transaction. The reported equity value was approximately $4.7 billion, with an enterprise value of approximately $8.3 billion including assumed debt. The transaction reflected the strategic importance of Spirit’s structures to Boeing programs and the difficulty of managing a deeply integrated supplier relationship at arm’s length. Since Spirit also produced Airbus structures, Boeing’s acquisition was paired with an agreement for Airbus to take selected Airbus-related sites and production assets directly. The Airbus transfer included Spirit operations in Kinston, Saint-Nazaire, Casablanca, Belfast, Prestwick, and selected activities in Wichita. Airbus-related A220, A320, and A350 work was separated from non-Airbus activities. Spirit also sold Fiber Materials to Tex-Tech Industries in 2025. After efforts to find a separate buyer for certain Belfast activities were unsuccessful, the planned allocation divided the operation between Airbus-related work transferred to Airbus and remaining activities transferred to Boeing. The Boeing acquisition and associated asset transfers were reported as completed in December 2025 after regulatory approvals and other closing requirements. Spirit’s history therefore moved from Boeing division, to independent Onex-owned manufacturer, to publicly traded diversified supplier, and finally back into a Boeing-controlled structure with selected Airbus operations transferred to Airbus.

2025
Airbus asset-transfer agreement announced
[1]Spirit AeroSystemsen.wikipedia.org
Spirit agreed to transfer selected Airbus-related sites and production assets to Airbus in conjunction with Boeing’s reacquisition.
2025
Boeing acquisition and related transfers completed
[1]Spirit AeroSystemsen.wikipedia.org
The Boeing acquisition and associated Airbus asset transfers were reported as completed after required approvals and closing conditions were satisfied.
2024
Boeing agreed to reacquire Spirit
[1]Spirit AeroSystemsen.wikipedia.org
Boeing agreed to reacquire Spirit in an all-stock transaction following years of financial, production, and quality-control pressure.
2021
Applied Aerodynamics acquired
[1]Spirit AeroSystemsen.wikipedia.org
Spirit purchased Applied Aerodynamics, adding aircraft aftermarket and maintenance, repair and overhaul capabilities.
2020
Bombardier transaction completed
[1]Spirit AeroSystemsen.wikipedia.org
The acquisition of Bombardier’s Belfast and Casablanca operations was completed, adding A220 and business-aviation work.
2020
Fiber Materials acquired
[1]Spirit AeroSystemsen.wikipedia.org
Spirit acquired Fiber Materials, a manufacturer of high-temperature materials and composites for defense and space applications.
2019
Bombardier aerostructures acquisition announced
[1]Spirit AeroSystemsen.wikipedia.org
Spirit agreed to acquire Bombardier Aviation’s aerostructures and aftermarket operations in Belfast and Casablanca.
2014
Onex exited Spirit
[1]Spirit AeroSystemsen.wikipedia.org
Onex sold its remaining shares, ending its ownership of Spirit AeroSystems.
2010
Kinston composites facility opened
[1]Spirit AeroSystemsen.wikipedia.org
Spirit opened a composites facility in Kinston, North Carolina, supporting Airbus A350 structural production.
2009
Subang facility opened
[1]Spirit AeroSystemsen.wikipedia.org
Spirit opened an operation in Subang, Malaysia, to expand capacity and reduce pressure on its European manufacturing activities.
2006
BAE Systems aerostructures business acquired
[1]Spirit AeroSystemsen.wikipedia.org
Spirit acquired BAE’s aerostructures operations at Prestwick and Samlesbury, strengthening its European and Airbus-related capabilities.
2006
Initial public offering
[1]Spirit AeroSystemsen.wikipedia.org
Spirit completed its initial public offering and began trading as a public company.
2005
Spirit AeroSystems established
[1]Spirit AeroSystemsen.wikipedia.org
Boeing sold its Wichita division and related Oklahoma facilities to Onex Corporation. The business began as Mid-Western Aircraft Systems and was subsequently renamed Spirit AeroSystems.
1941
Wichita operation became part of Boeing
[1]Spirit AeroSystemsen.wikipedia.org
The Wichita plant became the Wichita division of the Boeing Airplane Company and later supported major bomber and commercial-aircraft programs.
1927
Stearman Aircraft established the Wichita aerospace site
[1]Spirit AeroSystemsen.wikipedia.org
The Wichita manufacturing site that later became Spirit’s headquarters was established by Stearman Aircraft, creating the industrial foundation for the future operation.

Products and positioning

Aerospace tier-one supplier and manufacturer of large-scale aircraft structures, historically serving Boeing, Airbus, Bombardier, business-jet manufacturers, and defense customers.

Commercial-aircraft aerostructures
Boeing 737 fuselage sections
Spirit’s Wichita operation has historically produced major fuselage sections for the Boeing 737 family. These large assemblies form a central part of the aircraft structure and are shipped into Boeing’s final-assembly system.
Commercial-aircraft aerostructures
Boeing forward fuselage and flight-deck structures
Spirit manufactured nose, forward-cabin, and flight-deck structures for a majority of Boeing commercial-aircraft programs. The work involves complex structural assemblies delivered for integration into final aircraft production.
Composite and metal aerostructures
Boeing 787 fuselage structures
Spirit has supplied fuselage sections and related structures for the Boeing 787 program, contributing large assemblies to Boeing’s long-range widebody aircraft production system.
Widebody-aircraft aerostructures
Airbus A350 fuselage sections
Spirit’s Kinston and Saint-Nazaire operations supported production and partial assembly of Airbus A350 fuselage sections. The work combined composite manufacturing in North Carolina with downstream assembly in France.
Commercial-aircraft aerostructures
Airbus A220 wings and fuselage components
The Belfast and Casablanca operations produced important A220 structures, including wings and mid-fuselage components. These activities were among the Airbus-related assets designated for transfer to Airbus.
Wing structures
Airbus wing components and spars
Spirit produced wing structures and front wing spars for Airbus programs, including A320- and A350-related work. Selected production assets were transferred to Airbus under the 2025 restructuring agreement.
Business-aircraft aerostructures
Gulfstream aircraft wings
Spirit won contracts to manufacture wings for Gulfstream’s G280 and G650 business aircraft, extending its structural-manufacturing expertise beyond commercial airliners.
Defense and space aerospace
Defense and space composite structures
Through Fiber Materials and other operations, Spirit supplied high-temperature materials, composites, and structural components for defense and space applications, including work associated with military aerospace platforms.
Aerospace services · 2021
Aircraft aftermarket and MRO services
The Applied Aerodynamics acquisition added maintenance, repair, overhaul, and aftermarket capabilities in Dallas, complementing Spirit’s original manufacturing activities.

Controversies

2025
Alaska Airlines pilot sues Boeing and Spirit AeroSystems for $10M over 2024 door plug blowout
Captain Brandon Fisher, pilot in command of Alaska Airlines flight 1282, filed a complaint on Dec. 30, 2025 naming Boeing and Spirit AeroSystems Holdings as defendants, seeking $10 million in compensatory damages plus court costs. The complaint alleges Boeing attempted to shift blame onto the pilots and intentionally and falsely claimed the crew made mistakes, using Fisher as a scapegoat for the Jan. 5, 2024 mid-exit door plug blowout.
Source
2024
Alaska Airlines Flight 1282 door-plug incident
A door plug separated from a Boeing 737 MAX 9 operated by Alaska Airlines, causing an uncontrolled decompression. Spirit manufactured and initially assembled the relevant fuselage and door-plug structure, while Boeing performed final aircraft assembly. The incident intensified regulatory, customer, and public scrutiny of both companies’ manufacturing and inspection processes.
Source
2023
Allegations of systemic quality-control failures
A federal class-action filing by a Spirit employee alleged that workers had warned about safety and quality problems, including defect undercounting, records issues, concealment of manufacturing failures, and retaliation against employees who raised concerns. The allegations became part of broader scrutiny of Spirit’s production controls.
Source
2020
Spirit AeroSystems discloses accounting-process noncompliance
Spirit AeroSystems said an ongoing review found that it had not complied with established accounting processes for certain potential contingent liabilities received after the end of the third quarter of 2019. The company stated that no final conclusion had been made and that it believed the matter would not result in a third-quarter restatement or materially affect its fiscal-year 2019 financial statements.
Source

2025
Transfer Airbus-related operations to AirbusM&A
Background
Spirit’s independent ownership structure was being dismantled through Boeing’s reacquisition, but Spirit still operated several facilities and production lines dedicated to Airbus programs.
Action taken
Spirit agreed to transfer selected sites and assets in Kinston, Saint-Nazaire, Casablanca, Belfast, Prestwick, and Wichita to Airbus, while other operations moved to Boeing or were divested.
Aftermath
The arrangement divided Spirit’s former multi-customer network between Boeing, Airbus, and third-party owners.
Source
2024
Boeing reacquisitionM&A
Background
Spirit faced financial losses, production difficulties, and intense quality scrutiny, while Boeing sought greater direct control over a supplier deeply integrated into its aircraft programs.
Action taken
Boeing agreed to reacquire Spirit in an all-stock transaction. Airbus-related operations were separated through a concurrent asset-transfer arrangement.
Aftermath
Boeing resumed control of major non-Airbus operations, while selected Airbus production assets and sites moved to Airbus. Completion was reported in December 2025.
Transaction value. Approximately US$4.7 billion equity value and approximately US$8.3 billion enterprise value including assumed debt (Agreement announced in 2024; completion reported in December 2025)
Source
2019
Acquire Bombardier aerostructures and aftermarket operationsM&A
Background
Spirit aimed to expand its role in Airbus programs and add business-aviation and aftermarket capabilities.
Action taken
Spirit agreed to acquire Bombardier Aviation’s aerostructures and aftermarket operations in Belfast and Casablanca; completion occurred in 2020.
Aftermath
Spirit added A220 wing, fuselage, and related business-aviation work and increased its European and North African presence.
Source
2006
Acquire BAE Systems aerostructures operationsM&A
Background
Spirit sought to broaden its customer base and international manufacturing footprint beyond its inherited Boeing business.
Action taken
Spirit acquired BAE Systems’ aerostructures business based at Prestwick and Samlesbury.
Aftermath
The acquisition strengthened Spirit’s position in Airbus and European aerospace supply chains.
Purchase price. £80 million (2006)
Source
2005
Create an independent aerostructures manufacturerStrategy
Background
Boeing sought to divest selected manufacturing assets and improve capital efficiency, while Onex sought to operate the Wichita and Oklahoma facilities as a standalone supplier.
Action taken
Boeing sold the facilities to Onex, creating Mid-Western Aircraft Systems, later renamed Spirit AeroSystems.
Aftermath
Spirit became a major independent supplier, initially dominated by Boeing work but later pursuing customer and geographic diversification.
Transaction enterprise value. Approximately US$1.2 billion, including US$900 million in cash and assumed debt (June 2005)
Source

Recent events

2025.12.30
Reported2026.01.05
Alaska Airlines pilot sues Boeing and Spirit AeroSystems for $10M over 2024 door plug blowout[3]Alaska Airlines pilot sues Boeing and Spirit AeroSystems for $10M over 2024 door plug blowoutyahoo.com
Captain Brandon Fisher, pilot in command of Alaska Airlines flight 1282, filed a complaint on Dec. 30, 2025 naming Boeing and Spirit AeroSystems Holdings as defendants, seeking $10 million in compensatory damages plus court costs. The complaint alleges Boeing attempted to shift blame onto the pilots and intentionally and falsely claimed the crew made mistakes, using Fisher as a scapegoat for the Jan. 5, 2024 mid-exit door plug blowout.
2021.04.27
Reported2021.04.27
Spirit AeroSystems and EGAT sign joint venture agreement[5]Spirit AeroSystems与EGAT签署合资协议prnewswire.com
Spirit AeroSystems announced that it had signed a joint venture agreement with Evergreen Aviation Technologies Corporation (EGAT) to form Spirit Evergreen Aftermarket Solutions and transfer repair capabilities to it. Formation of the joint venture remains subject to conditions precedent, including foreign investment approval.
2021.02.08
Reported2021.02.08
Infosys announces strategic collaboration with Spirit AeroSystems[6]Infosys宣布与Spirit AeroSystems开展战略合作business-standard.com
Infosys announced a strategic collaboration with Spirit AeroSystems, which selected Infosys as its lead technology integration partner for integrating applications and infrastructure for certain recently acquired assets.
2020.11.03
Reported2020.11.03
Spirit AeroSystems completes acquisition of selected Bombardier assets[7]Spirit AeroSystems完成收购庞巴迪部分资产asdnews.com
Spirit AeroSystems announced that it completed the acquisition of selected Bombardier aerostructures and aftermarket services assets in Belfast, Casablanca and Dallas.
2020.06.26
Reported2020.06.26
Spirit AeroSystems partners with Virgin Hyperloop on a prototype[8]Spirit AeroSystems 与 Virgin Hyperloop 合作开发原型wibw.com
Spirit AeroSystems and Virgin Hyperloop partnered to develop a prototype for the hyperloop transportation venture. Spirit said it would contribute engineering, fabrication, construction, supply-chain, certification, and technical expertise.
2020.06.12
Reported2020.06.12
Spirit AeroSystems expands production capacity in Wichita[9]Spirit AeroSystems 扩大威奇托生产能力areadevelopment.com
Spirit AeroSystems expanded production capability at its Wichita, Kansas manufacturing center, supported by $80 million allocated by the Department of Defense for advanced tooling and fabrication capabilities.
Unconfirmed
Reported2020.04.12
Spirit AeroSystems halts Boeing fuselage work and furloughs workers[10]Spirit AeroSystems 暂停波音机身工作并让员工暂时休假ibtimes.com
Spirit AeroSystems halted work on Boeing commercial aircraft fuselages and furloughed about 3,200 Boeing-related production employees in Kansas and Oklahoma for 21 days amid the COVID-19 pandemic.
Unconfirmed
Reported2020.02.27
Spirit AeroSystems opens Prestwick manufacturing facility[11]Spirit AeroSystems开放普雷斯蒂克制造设施airport-technology.com
Spirit AeroSystems opened a manufacturing facility at its Prestwick site in Scotland to manufacture spoilers for the Airbus A320 family. The facility is expected to generate more than 100 new jobs in the UK.
2020.01.30
Reported2020.01.30
Spirit Aerosystems CFO and controller resign[4]Spirit AeroSystems discloses accounting-process noncompliancetoronto.citynews.ca
Spirit Aerosystems said CFO Jose Garcia and John Gilson, its vice-president, controller and principal accounting officer, resigned in light of findings from the accounting-process review.
2020.01.30
Reported2020.01.30
Spirit Aerosystems announces gradual restart of 737 Max component production[4]Spirit AeroSystems discloses accounting-process noncompliancetoronto.citynews.ca
Spirit Aerosystems announced that it would gradually restart production of 737 Max airplane components after reaching a deal with Boeing, and planned to ramp up deliveries during 2020.

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