Denver-based Frontier Airlines has confirmed an order for 15 new airplanes worth more than $50 million each.
European airplane maker Airbus has also granted conversion rights to Frontier. That allows the airline to change some of the newly ordered planes from A-319s to larger A-320 models.
Airbus will deliver the aircraft beginning next year and continue through 2008.
Frontier also plans to lease up to 14 additional planes over the next five years. The carrier expects to have a fleet of 62 planes by early 2008, up from 38 Thursday.
The deal confirms a letter of intent signed earlier this month.
Frontier is hoping to inherit gate space at Denver International Airport if bankrupt United Airlines is forced to reduce operations.