Spirit Airlines is the most complained about airline in America.
That's according to a report by the US PIRG Education Fund.
The consumer advocacy group examined complaints to the US Department of Transportation's Aviation Consumer Protection Division about major US airlines from 2009 to 2013.
They found Spirit generated about three times more complaints per passenger than any other airline.
Frontier Airlines received the second largest number of complaints per passenger.
United Airlines and American Airlines took the third and fourth spots.
The report cited extra fees, oversold tickets, flight delays and cancellations as the top complaints among travelers.
The airlines that generated the fewest complaints were Southwest Airlines, Alaska Airlines, AirTran Airways and JetBlue Airlines.
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