© Larry Downing/Reuters/Corbis

No. 2: United Airlines

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1.34 complaints per 100,000 passengers

The skies aren’t so friendly to passengers when it comes to mishandled luggage or flight cancellations and delays. True, the airline’s record is improving—the complaint rate in 2008 was 1.86—but its planned merger with Continental may cause more snafus, at least in the short term.

Most-Complained-About Airlines 2010

No. 2: United Airlines

1.34 complaints per 100,000 passengers

The skies aren’t so friendly to passengers when it comes to mishandled luggage or flight cancellations and delays. True, the airline’s record is improving—the complaint rate in 2008 was 1.86—but its planned merger with Continental may cause more snafus, at least in the short term.

© Larry Downing/Reuters/Corbis

Most-Complained-About Airlines 2010

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