Bombardier has secured another firm order for its CSeries programme, after an unidentified European customer booked 10 of its CS100 twinjets.
It disclosed the order during the Paris air show, the third deal for CSeries unveiled at the event.
While it is not identifying the customer it said it is a "first-time buyer" for Bombardier aircraft.
The airframer adds that the order, which it values at $628 million, brings to five the number of customers signing for the aircraft this month.
"This order tops off a very successful Paris air show and a strong wave of order activity in June," said Bombardier Commercial Aircraft president Gary Scott.
It brings the total number of firm CSeries orders to 123, comprising 61 CS100s and 62 CS300s.
Lufthansa has signed for 30, Republic Airways for 40, Lease Corporation International for 20, and Braathens Aviation for 10.
Three other unidentified customers, including the latest, are taking another 23 between them.
Korean Air has signed a letter of intent for up to 30 and customers have also taken options on another 109 aircraft.