A number of European airlines also served the airport from the mid-1960s to the mid-1980s, including British Caledonian Airways with Boeing 707s, KLM Royal Dutch Airlines with Douglas DC-8s and Sabena, Swissair and UTA with these three air carriers all operating McDonnell Douglas DC-10s into Robertsfield. Scandinavian Airline System also served Monrovia, from Copenhagen. In the mid-1970s this service consisted of a weekly flight via Düsseldorf and Madrid and a second weekly flight via Zürich, then onward to South America: Rio de Janeiro, Montevideo, and Santiago de Chile.