The Farman F.121 Jabiru is arguably one of the ugliest aircraft ever. It was, for reasons of safety (it had 4 engines), used by Det Danske Luftfartselskab in the competition against the Swedish AB Aerotransport. Incidently, both companies are now part of Scandinavian Airlines Systems).
Two Farman Jabiru were delivered to DDL in 1926 from France, and two more were built under license in Denmark by Orlogsværftet. The aircrafts were scrapped in 1931. The Jabiru had four 180 h.p. Hispano Suiza 8ac water-cooled engines, two in each nacelle. The main passenger cabin accommodated six, and the aircraft had a crew of two.
Length: 13.92 m (45 ft 8 in)
Wingspan: 19.00 m (62 ft 4 in)
Height: 4.50 m (14 ft 9 in)
Wing area: 81 m² (871 ft²)
Empty weight: 3,404 kg (7,497 lb)
Max takeoff weight: 5220 kg (11,497 lb)
Powerplant: 4× Hispano-Suiza 8Ac, 244 kW (180 hp) each
Maximum speed: 210 km/h (130 mph)
Cruise speed: 175 km/h (108 mph)
Range: 750 km (466 miles)