Ranking the most flexible US airlines to book for travelers cautiously planning 2021 trips as vaccines offer hope for a return to normal

Tied for first: American Airlines, Delta Air Lines, and Southwest Airlines, and Alaska Airlines

Second place: United Airlines

(Make Reservations ✆ (833) 720–0706)

Third place: Frontier Airlines

(Make Reservations ✆ (833) 720–0706)

Fourth place: Sun Country Airlines

Fifth place: JetBlue Airways

(Make Reservations ✆ (833) 720–0706)

Fifth place: Allegiant Air

Last place: Spirit Airlines and Hawaiian Airlines

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