'Blind Side' Star Quinton Aaron -- Forced Off a Flight ... For Being Too Fat

Quinton Aaron was booted from a flight Friday for excess baggage -- his stomach.

Quinton -- who stands 6'8" and weighs 500 lbs -- tells TMZ ... he typically buys 2 seats when he flies but only one was available.

Quinton boarded the U.S. Airways jet in Philly for a 1 hour flight to Rochester, but never even got to hear the safety message. He says the passenger who was booked in the coach seat next to him was blindsided and could not wedge himself onto the cushion because of Q.A.'s girth.

Quinton says he talked it out with the flight attendant -- to no avail -- and he was politely asked to leave the plane and then booked on a later flight ... where he secured 2 seats.

Quinton adds, “I definitely need two seats ... It worked out for the better … my knees weren’t pushed into the back of the metal on someone else’s seat.”