NEW : TO : ` ` We 're not clear '' on what caused the hole . A pilot discovered a small hole in the side of the aircraft . An FBI report indicates the hole is bullet - sized , but not necessarily from a bullet . The plane flew from Philadelphia and landed at Charlotte without incident .
NEW : Airline : `` We 're not speculating '' on what caused the hole . A pilot discovered a small hole in the exterior of the aircraft . An FBI spokeswoman says the hole is bullet-sized , but not necessarily from a gun . The plane flew from Philadelphia and landed at Charlotte without incident .