Wallethub, in its most recent study, found Sprit to be its Best Airline. Wallethub looked at nine of the country's largest airlines and based their findings on things like cancellations, delays, costs ...

Spirit and Frontier operate the same aircraft and their cabins are similarly configured with Frontier soon to add first-class seats.

Carriers are hoping that wealthier leisure travelers will continue to treat themselves to pricier, roomier seats.