Discount carrier Spirit Airlines has completed an order for 75 Airbus A320s, the plane maker said on Wednesday.
The deal, worth USD$7 billion a list prices, includes 45 revamped A320neos, which are due to be available later this decade.
It also calls for 30 of the current A320 model.
It confirms a tentative agreement first announced at the Dubai air show in November.
Miramar, Florida-based Spirit, which calls itself an "ultra low-cost" carrier, operates more than 150 flights a day.