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Choose an airline to learn what to know before you book.

Newark, Chicago, Denver, San Francisco and Houston are among its biggest hubs.

Atlanta, Detroit, Minneapolis and Salt Lake City are among its biggest hubs.

It serves Dallas Love Field, Denver, Las Vegas, Chicago Midway and many other busy domestic airports.

Dallas/Fort Worth, Charlotte, Miami and Chicago are among its biggest hubs.

Seattle, Portland and San Francisco anchor much of its West Coast network.

New York JFK, Boston and Fort Lauderdale are key cities on its map.

Fort Lauderdale, Las Vegas and Orlando are important cities for this low-fare carrier.

Denver and Orlando are important cities for this low-fare carrier.