Delta Air Lines

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Delta Air Lines passenger Jim Tonjes was high above North America when he bit into a hot turkey sandwich and felt a sudden jab in his mouth from a needle. (AP Photo/Jim Mone)

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A Delta Air Lines jet takes off from Detroit Metropolitan Wayne County Airport, one of the airline's hubs, in Romulus, Mich., on Friday, July 22, 2011. (AP Photo/Carlos Osorio)

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** FILE ** Passengers walk past a Delta Air Lines Boeing 747 at the Detroit Metropolitan Wayne County Airport, one of Delta's hubs, in Romulus, Mich., in January 2010. (AP Photo/Paul Sancya, File)

A Delta Air Lines plane sits on the tarmac in a remote section of New Mexico's Albuquerque International Sunport on Sunday, May 8, 2011, after the flight, en route from Detroit to San Diego, was diverted over what authorities are calling a "potential security threat." (AP Photo/KRQE News 13, Katie Kim)

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A Delta Air Lines jet takes off from Boston's Logan International Airport. United and Continental airlines started the push for another fare increase last week and were joined by Delta, American and US Airways. But low-cost airlines didn't go along. By Monday morning, US Airways was the only one of the major airlines that still had the higher fares. (AP Photo)

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An artist's rendering shows Bisoux, one of the restaurants set to open in the Delta Air Lines terminal at LaGuardia Airport. With travelers waiting longer, more airports are installing sit-down restaurants. (ICrave via Associated Press)

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** FILE ** In this file photo taken June 7, 2010, a Delta Airlines Inc. plane sits on the tarmac at Seattle-Tacoma International Airport in Seattle. Delta Air Lines reversed a second-quarter loss with with what it said Monday, July 19, is its largest quarterly profit in a decade thanks to strong passenger revenue. (AP Photo/Ted S. Warren, File)