The Boeing 767F was designed for cargo operations. The -300F and -300ER variants have the same payload weight and is higher than the -300. The F, like the other variants, has options for winglets which improve fuel efficiency. The aircraft can also be converted from a passenger aircraft by Boeing and other companies around the world. The BCF as it's known, Boeing Converted Freighter, is exactly like the F after the completion of the renovation and includes the cargo door that would not have been there originally.