North African carrier EgyptAir has firmed an agreement to order 12 Bombardier CS300s and take purchase rights on a further 12, the Canadian manufacturer has disclosed.
This converts a letter of intent announced during the Dubai air show in November.
"Welcoming EgyptAir to the family of CSeries operators is another landmark moment for Bombardier," states Fred Cromer, president of the airframer's Commercial Aircraft unit.
Bombardier asserts that the order will "enable EgyptAir to better serve domestic and regional destinations as well as several European and African destinations".
Safwat Musallam, the Star Alliance airline's chief executive, credits the CS300 with a "unique profitability profile" which "will allow us to open up new opportunities and fits perfectly into our growth strategy".
The order gives the CSeries its first confirmed new customer since June 2016, when Air Canada finalised an order for 45 CS300s.
EgyptAir's interest in the small narrowbody was revealed in the weeks after Bombardier announced an agreement in October to give Airbus a majority stake in the joint venture that manages the CSeries.
In November, Bombardier disclosed a letter of intent covering 31 firm CSeries aircraft – plus 30 options – for a European customer, but that deal has not been finalised.
This story has been updated to clarify a figure in the final paragraph