United Airlines planes sit on the tarmac at San Francisco International Airport on July 8, grounded by a computer glitch. Some 3,500 United passengers around the world were delayed. Justin Sullivan/Getty Images hide caption

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United Airlines Faces Steep Ascent In Not-So-Friendly Skies

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A United Airlines 747-400 taxis at San Francisco International Airport in 2011. A group of flight attendants have filed suit against the airline to contest their firing over their handling of a perceived safety threat. Eric Risberg/AP hide caption

toggle caption Eric Risberg/AP