Bombardier operation in Northern Ireland is on the verge of being sold to a US company, according to Reuters news agency.
The Canadian company launches the factories for sale in May as part of a reorganization of its business.
The aircraft manufacturer employs 3600 people in Northern Ireland.
Reuters say US Spirt AeroSystems is on the verge of a deal and a release may come later today.
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No company has commented on the proposed transaction.
A bigger position in the supply chain?
Analysis: John Campbell, Economics and Business Editor, BBC News NI
Bombardier is selling off its commercial aerospace assets to focus on trains and business planes: This will be the last part of it.
Spirit is based in Wichita, Kansas and was originally created as a spin-off of the aerospace company Boeing.
Boeing is still its largest client, but part of Spirit's strategic plan is to reduce its dependency on Boeing.
Earlier this year, Spirit stated that it wanted to supply more to Airbu s, increase its production capacity and receive more military work.
If a Bombardier deal is struck, it will tick two of these boxes and give them a much bigger position in the Airbus supply chain.
Bombardier, which is based in Montreal, has over 68,000 employees in 28 countries.
It employs around 3 600 people in several places in Northern Ireland ̵
The Belfast plant builds wings for Airbus and is the largest manufacturer of high-tech technology in Northern Ireland.