Planemaker Bombardier has won a deal worth almost £200m to supply new aircraft to the regional airline Flybe.
The company has placed an order for 15 turbo-prop airliners
The company has placed an order for 15 turbo-prop airliners which are partly made at Shorts in Belfast, and Flybe has taken options on 15 more planes.
The carrier already operates the world's largest fleet of the plane type, the Q400.
Flybe's Jim French praised the aircraft's "customer appeal and economics".
"For the future though, most importantly its environmental credentials are exceptional.
"It is one of the quietest and most effective aircraft, ideally suited for the regional markets of the world."
Steven Ridolfi, president of Bombardier Regional Aircraft, said: "Very low operating costs, jet-like speed and a spacious, quiet and comfortable cabin distinguish the Bombardier Q400 from the competition.
"We are delighted that Flybe will continue to grow their fleet with the Q400 airliner."