Sabena airliners which were augmented and later replaced by Douglas DC-6Bs. The DC-4s also restarted the airline's traditional route to the Belgian Congo. Sabena was the first airline to introduce transatlantic schedules from the north of England, when one of its DC-6Bs inaugurated the Brussels-Manchester-New York route on 28 October 1953. The Convair 240 was introduced in 1949 to partially replace the DC-3s that until then had flown most European services. As of 1956, improved Convair 440 "Metropolitan" twins began replacing the Convair 240 twins and were used successfully well into the 1960s between European regional destinations. In 1957, the long-range
Association of European Airlines operated over 8,000 flights a day, serving 530 destinations in 140 countries, with a global turnover of €100 billion. AEA traces its history back to 1952, when the Presidents of Air France, KLM, Sabena and Swissair formed a joint study group, shortly afterwards expanded with the addition of BEA (a forerunner of British Airways) and SAS. In February 1954, the Air Research Bureau was established on a permanent basis, in Brussels. The name was subsequently changed to the European Airlines Research Bureau and - in 1973 - the AEA. Shortly after the ARB was established, the 1954 Strasbourg Conference on