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
European Regions Airline Association Single European Sky", a set of proposals to strengthen the legislative basis for the Single European Sky. In July 2013, when the European commission called for all state subsidies for airports to end within 10 years, the ERA criticized the proposal, arguing that this decision will have a negative impact on the development of regional airlines and airports. In 2014, the ERA pledged for a hiatus of the European Union Emissions Trading System until a compromise with other international authorities could be reached. The European Regions Airline Association makes an annual regional "Airport of the Year" award, which in 2016