 The 707-320B series enabled nonstop westbound flights from Europe to the West Coast of the United States and from the US to Japan.The final 707 variant was the 707-320C, (C for "Convertible"), which had a large fuselage door for cargo.It had a revised wing with three-sectioned leading-edge flaps, improving takeoff and landing performance and allowing the ventral fin to be removed (although the taller fin was retained).