Frontier Airlines (F9, Denver International) has placed a firm order with Airbus (AIB, Toulouse Blagnac) for nine A321-200s, its first such order of the type. The Ultra Low Cost Carrier (ULCC) currently operates a fleet of thirty-five A319-100s, and twenty A320-200s.

The order brings Frontier's Airbus order backlog to 89 including eighty A320neo Family aircraft.

Frontier began its transition to an all-Airbus fleet when it took delivery of its first A319 in 2001.