The Boeing 757 freighter is a derivative of the twin-engine 757-200 passenger jetliner. It is similar in external appearance except for the lack of passenger windows and doors. The 757-200 Freighter is a dedicated freighter designed to accept up to 15 cargo containers on its main deck. Major features include a large side cargo door in the forward fuselage, a single crew entry door just ahead of it and a windowless freighter interior measuring 6,600 cubic feet of cargo space on the main deck. Additional freight can be carried in the lower holds located forward and aft of the wing.