As of September 30, Bombardier had taken 360 total orders for CS100s and CS300s, and delivered just 19.
EgyptAir Airlines plans to buy 12 of Bombardier's biggest variant of the jet, the CS300, and has options for a further 12, the carrier said on Tuesday at the Dubai Air Show.
Earlier this month an unnamed European airline said it meant to buy at least 31 of the C-Series planes.
A Bloomberg report said the EgyptAir buy was "especially significant for Bombardier, which gains another customer for its new jet less than a month after the company agreed to cede control of the C Series to Airbus in exchange for the European planemaker's marketing heft and manufacturing expertise". The deal is valued at $1.1 billion before discounts.
"We were ordering the CSeries anyway", Musallam says.
The deal was inked at the ongoing Dubai Airshow.
Colin Bole, Bombardier's senior vice president of commercial aircraft, said there were no particular conditions or terms that needed to be met to finalize the deals.
The Bombardier logo is seen at the Bombardier factory in Belfast, Northern Ireland September 26, 2017.
The total order would be valued at almost $2.2 billion, Bombardier said, at current list prices.
Bombardier is engaged in a trade dispute with Boeing, which complained that the CSeries had been subsidized and sold below cost in the United States.
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.