The airline entered the jet age when in February and May 1967 two Convair 990 four engine jetliners joined the fleet after being purchased second hand from American Airlines. Between 1968 and 1972, an additional eight Convair 990s would join the fleet; two of which were leased to Iberia Airlines between 1967 and 1969 whilst that airline experienced delays in the delivery of its own Douglas DC-8s. The airline acquired a further four Convairs from Swissair in April, May and June 1975, and the airline would become the world's largest operator of the type. The last one was retired in the mid 1980s.