On 2 March 1960 the landing of Lufthansa's first Boeing 707 in Hamburg ushered in the jet age. The Frankfurt airport was to become the future homebase of the new long-haul jets. Lufthansa began building a maintenance base at Rhine-Main airport. Frankfurt subsequently became the most important hub in Lufthansa's route network and the center for daily maintenance. In 1962 Lufthansa opened a test stand for jet engines at its maintenance base in Hamburg. It also built the world's first noise-protection hangar there. In the sixties, in addition to its own aircraft, it began servicing those of other customers. The U.S. FAA authorized Lufthansa's engineering division to service the aircraft and engines of American airlines. Even then Lufthansa's engineers were developing their own repair procedures that attracted airlines from all over the world to Hamburg.