On 6 July 1959, VASP, Cruzeiro do Sul and Varig initiated the air shuttle services between Rio de Janeiro-Santos Dumont and São Paulo-Congonhas airports, the first of its kind in the world. The three companies coordinated their schedules, operations, and shared revenue. The service was a direct response to the competition imposed by Real Transportes Aéreos. The idea, baptized as Air bridge ( in Portuguese), inspired on the Berlin Airlift was so successful that it was abandoned only in 1999. Flights operated on an hourly basis initially by Convair 240 (Varig), Convair 340 (Cruzeiro) and Saab 90 Scandia (VASP). In a matter of a few months the shuttle service led by Varig won the battle against Real, which was anyway bought by Varig in 1961. Sadia Transportes Aéreos joined the service in 1968. Between 1975 and 1992 it was operated exclusively by Varig's Lockheed L-188 Electra which for sometime and for the sake of neutrality did not have the name Varig on the fuselage.