Frontier Airlines (F9, Denver International) has placed a firm order with Airbus (AIB, Toulouse Blagnac) for ten A321-200 (sl)s and two A320-200 (sl)s bringing its current backlog with the European manufacturer to 101 jets.

The US LCC operates an all-Airbus fleet of thirty-four A319-100s and twenty-one A320-200s.