His second airline venture began flying cars and their owners across the English Channel in 1954, initially using a fleet of Bristol Freighter twin-engined, piston-powered planes. These were later supplemented and eventually superseded by the larger-capacity, four-engined Carvairs. The Carvair design was based on the Douglas DC-4 piston-engined airliner. It involved raising the aircraft's cockpit "above" the fuselage in a 747-style bulge so as to create more space for vehicles and/or passengers on the main deck. It also involved replacing the DC-4's original tail fin with a newly designed, larger DC-7-style fin as well as equipping the aircraft with a Bristol Freighter-type nose-loading cargo door, more powerful brakes and a stronger undercarriage.