A Bombardier Aerospace customer has signed a Conditional Purchase Agreement for up to 13 CS300 aircraft.
The deal, which is worth around $553m (£323m) was announced at the Farnborough Airshow.
The customer, who wants to remain anonymous at this time, has placed an additional conditional order for seven firm CS300 airliners as well as purchase rights for six additional CS300 aircraft.
Ray Jones, Senior Vice President at Bombardier, said: “The CSeries airliner, with its best in-class economics, advanced technology and outstanding performance, will be instrumental in replacing older, less efficient aircraft presenting challenges because of high fuel costs and heightened environmental awareness.”
Bombardier also announced that another unidentified existing customer has signed a letter of intent to acquire five CSeries airliners. The African airline’s order is worth around $365m (£213m).
Mike Arcamone, president of Bombardier Commercial Aircraft, said: “The exceptional fuel efficiency and widebody passenger comfort that only the CSeries aircraft can provide in an airplane of its size were key factors in our customer’s decision to select the CSeries in a region where fuel prices are quite high.”
On Tuesday, it emerged that Bombardier’s CSeries order book has grown to 495.
Bombardier in Belfast is responsible for the complete centre fuselage, engine nacelles and flight components for the CRJ900. It also designs and produces the advanced composite wings for the CSeries aircraft.