With the EgyptAir announcement, up to 85 new CSeries jets are covered by commitments disclosed since Bombardier agreed to transfer a majority stake in the small narrowbody programme to Airbus in a deal set be finalised in the second half of 2018.
The agreement announced at the Dubai Airshow includes 12 CS300 aircraft with purchase rights for an additional 12 aircraft.
EgyptAir has signed a letter of intent for up to 24 Bombardier CS300s at the Dubai Air Show.
The EgyptAir deal is valued at $1.1 billion based on list prices.
The U.S. Commerce Department has imposed harsh duties on Bombardier, charging the Canadian company of selling the C Series planes in America below cost and receiving government subsidies.
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No Middle East customer has said when it would take delivery of CSeries jets. Shares rose 2.3 percent to C$3.13 at 10:02 a.m.in Toronto.
Earlier this month an unnamed European airline said it meant to buy at least 31 of the C-Series planes.
Davy Thompson, Unite's regional co-ordinating officer for Northern Ireland, said the latest order for 12 CS300 Bombardier aircraft from the EgyptAir Holding Company is a positive signal for Northern Ireland. "Swiss and Air Baltic Corp., which began flying the CS300 in December, have reported better-than-expected fuel efficiency, which is key to the jet's appeal".
EgyptAir is separately expected to unveil a deal for at least six Boeing 787 Dreamliners, the first passenger jets made from lightweight carbon-fiber composites, said people familiar with the discussions.