US lessor International Lease Finance has ordered 25 Airbus A321neos as part of its agreement to take 100 aircraft from the re-engined family.
Airbus disclosed the initial breakdown of ILFC's order in its backlog figures covering the first four months of this year.
Along with 25 A321neos the lessor is taking 75 A320neos. The agreement is the first firm order for A320s listed by Airbus so far this year - although in the first quarter it secured orders for 22 other A321s and two A319s.
The ILFC deal, which also involved the cancellation of 10 A380s, was the only activity recorded by the airframer during April.
It brought Airbus's gross order total for 2011 to 169 aircraft, with 79 cancellations reducing the net figure to 90 airframes.
Airbus delivered 167 aircraft over the period, a rate which, if maintained, would give it 500 deliveries for the whole year.
These deliveries comprised five A380s, 30 A330s and 132 A320-family jets.