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Comedian Guy Branum is sharing an air travel nightmare ... he says the guy sitting next to him on a Delta flight gave him an elbow to the ribs because he felt Guy was too fat for the middle seat.

Guy tells TMZ ... he was on a Delta flight Sunday from New York to Los Angeles when a fellow passenger hit him before takeoff. He says he reported the alleged incident to a stewardess and the flight was delayed while Delta investigated. Play video content

The comedian posted video from the interaction and he's in the middle seat, arguing with a man seated in the aisle. The man mentions being a member of Weight Watchers and they bicker about the armrest and personal space.

Guy says the flight crew was "amazing" and "supportive," but the Delta Red Coat who came over to investigate "trea

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