About Allegiant Air Allegiant Air is a low-cost American airline which was founded in 1997 and started operating in June 1998. The airline operates scheduled flights to over 100 destinations across the world from its headquarters in Enterprise, Nevada. Allegiant Air’s focus cities include Bellingham International Airport, Fort Lauderdale, Los Angeles International Airport, McCarran International Airport, Phoenix-Mesa Gateway Report, etc. It has been listed among America’s 100 Best Small Companies in the Forbes Magazine. The airline has also been recognised by the Fortune Magazine as one of the Fastest Growing Companies of America.