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Reuters
Before Airbus took over most of the stake in the project, the A220 was previously known as the Bombardier CSeries.
Bombardier's Northern Ireland division was sold to the US company Spirit AeroSystems in a deal worth about £ 1 billion.
The Canadian company sold its plant in May as part of its business reorganization.
Aerospace manufacturers employ about 3,600 people in Northern Ireland.
Headquartered in Kansas, Spirit is a major supplier of Airbus and Boeing. Earlier this year, the company said it wanted to do more for Airbus.
Bombardier's purchase of Operation Northern Ireland is part of that strategy.
The wings of the Airbus A220 are made at the Bombardier Belfast factory and also supply other Airbus components, especially the engine cover.
Spirit is also buying repair facilities in Morocco and the United States, the Bombardier factory.
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Analysis: strategic purchase of Spirit
The Bombardier workforce in Northern Ireland has suffered years of cuts and uncertainties.
At some point, the Canadian company was on the verge of bankruptcy.
New owners of Belfast operations must bring stability to the workforce and a long-term focus on business.
This is a strategic purchase by Spirit. Belfast sees it as a key part of their plans to do more with Airbus.
The union is pleased that the business went to trade buyers, not private equity.
The agreement that Spirit pays $ 500 million and acquires $ 700 million in debt, including pension commitments, is expected to end in the first half of 2020.
Michael Ryan, chief operating officer of Bombardier's aviation structure, said it will be updated on how employees are making timely impacts.
He added: “We are pleased that Spirit, the world's first-tier aviation manufacturer and supplier, recognized its unique products and growth potential.
ADS, the UK's trade organization representing the aerospace industry, said: “As the future of work is ensured, the exceptional workforce of Belfast facilities will now continue to use world-class expertise and skills as an integral part. Aerospace industry
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Boeing 737 Max 8 fuselage is manufactured by Wichita Spirit Aerosystems.
"We look forward to working closely with Spirit as our UK footprint continues to grow."
The agreement will be strategic for aerospace component maker Spirit, unlike Boeing, which will diversify its customer base, analysts said.
Chief Executive Tom Gentile said Belfast operations "provide Spirit with world-class engineering expertise."
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"Belfast has developed an impressive position in the business jet fuselage production, in addition to its globally recognized fully integrated A220 composite wing."
"This acquisition is consistent with our growth strategy of increasing Airbus content, developing low cost country space, and growing aftermarket business."
What is Spirit AeroSystems?
- One of the world's largest primary manufacturers and suppliers of aviation rescue
- Founded in 2005 as part of the aerospace company Boeing
- We have offices in the United Kingdom, Malaysia, France and the United States and employ more than 15,000 people worldwide.
- About 12,000 employees are headquartered in Wichita, Kansas.
The business is part of Bombardier's plan to discontinue its commercial aviation business to focus on profitable business jet and rail operations.
The Belfast plant will remain the main supplier of Bombardier's business jet program.
"Spirit will continue to supply structural aircraft components and spare parts to support vehicles in production and in service of Bombardier Aviation's Learjet, Challenger and Global fleet of aircraft."
This contract has been widely welcomed by politicians and people of the business community.
Unity's sale has given hopes for a positive future for Bombardier workers in Northern Ireland, and GMB's union said it will seek talks with spirit executives to "get a guarantee on jobs, conditions and pensions." .
Based in Montreal, Bombardier has more than 68,000 employees in 28 countries, and the Belfast plant is Northern Ireland's largest high-tech manufacturer.
Last year, we reported quarterly profit decline as production in the Global 7500 business increased. Spirit saw quarterly revenue drop of 22{7be40b84a6a43fc4fae13304fce9a2695859798abfc41afd127b9f8b21c5f9c5} due to 787 Dreamliner aircraft-related charges.