US carrier Frontier Airlines has converted a batch of 15 Airbus A320neo orders to the larger A321neo.
The airline had 34 A321neos on order – none of which has yet been delivered – but this figure has risen to 49 in the airframer's latest backlog revision.
Frontier's firm A320neo commitment has correspondingly reduced to 165 aircraft of which 41 had been delivered by the end of July.
The US carrier is one of the airlines which signed up for the long-range A321XLR variant of the A321neo during the Paris air show.
Investor Indigo Partners unveiled a memorandum of understanding for 50 A321XLRs during the show – comprising 32 new orders and conversion of 18 A320neo-family jets already in the backlog.
Frontier Airlines is due to receive 18 XLRs out of the 50. The A320neos already in service with the operator are fitted with CFM International Leap-1A engines.
Conversion of the 15 Frontier A320neos takes Airbus's total orders for the A321neo to one shy of 2,700 aircraft. It has delivered 204.