Sabena during this decade. Boeing 727-100s were introduced on important European routes and also some African services from 1967 in a unique colour scheme; the fin markings incorporated bare-metal rudder and white engine colours. The only other aircraft to have its own special markings was the McDonnell Douglas DC-10. At this time Fokker F27 Friendships entered service between regional Belgian airports and European destinations such as London Heathrow. The Boeing 747-100 was introduced in 1971, on transatlantic routes flying alongside the Boeing 707-320Cs. Sabena, like many other trans-Atlantic airlines, was satisfied with the Boeing 707s. For commercial reasons it was recognised
Alcazar (airline) Sabena. In addition, they had a strong tie with Northwest Airlines. In 1989, KLM bought 20 percent of the then ailing airline. In 1992, KLM had made a bailout purchase of Northwest, securing a 25 percent ownership of the airline, which is the maximum a foreign airline is allowed to own in a US airline. Swissair cooperated with Delta Air Lines and Singapore Airlines in a triangular cooperation, which was highly valued by the company's management. Delta was significantly larger than the other two US partner airlines, and had a base in New York City, rather than Northwest's hubs in