Czech Airlines has emerged as an Airbus A220 customer, ordering four of the -300 variant as part of an agreement which includes converting A320neos to the long-range A321XLR.
The flag-carrier had seven A320neos on order but last month cancelled four of them.
Airbus says the airline has instead ordered four A220-300s, which will be configured with 149 seats.
The airframer revealed earlier this month that an undisclosed customer had ordered four A220-300s and 10 of the smaller A220-100.
Airbus has not confirmed whether Czech Airlines is the customer behind this agreement for 14 aircraft, and the Czech Airlines agreement does not mention A220-100s.
But the carrier is converting the three remaining A320neos to the long-range A321XLR which was formally unveiled at the Paris air show earlier this year.
The Czech A321XLRs will be fitted with 195 seats in two classes.
Czech Airlines chairman Petr Kudela says the aircraft "fit well" with the company's long-term network strategy and enable it to increase capacity on its routes.
No engine selection has been disclosed for the A321XLRs. The carrier had not revealed an engine choice for the previous A320neos. A220s are exclusively powered by the Pratt & Whitney PW1500G engine.