Allegiant Air (or, more simply, Allegiant) is one of North America's largest ultra-low-cost airlines and has been flying for over 20 years. Allegiant operates a fleet of Airbus A319 and A320s that are set to be joined by the Boeing 737 MAX (although it is not one of the top five largest low-cost carriers). Despite being a low-cost airline, Allegiant has its own loyalty program known as Allways Rewards. Unlike many other airline loyalty rewards programs, Allways Rewards is refreshingly simple.