Swissair DC- 7c, seven seas, das modernste Flugzeug by Wirth Kurt / 1956 "The Swissair DC-7C, seven seas, is the most advanced aircraft". In 1956 Swissair order five long-range Douglas DC-7C Seven-Seas piston-engined airliners for the trans-Atlantic operations. The DC-7C was able to fly direct trans-Atlantic flights except in very bad weather conditions. The last DC-7C was delivered to Swissair in 1958. A great Swiss style photo-montage poster by Kurt Wirth.