USAirways admitted it allowed a Vietnamese potbellied pig to ride in first class on a flight from Philadelphia to Seattle after a female passenger produced a doctor's note saying that she needed to be with her "therapeutic companion pet" to relieve her stress. While the note specified a 13-pound pig, it turned out to be closer to 300 pounds. Passengers complained that on landing the animal become unruly and attempted to enter the cockpit until one quick-thinking passenger threw food at it.

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