As had been done with CAMPSA and with CTNE, a monopoly was created by merging existing Spanish air transport companies.

[2] CLASSA's inaugural flight took place on 27 May 1929 between Getafe (Madrid) and Sevilla although regular operations wouldn't officially start until November.

[3] CLASSA was an airline established following the creation of the Higher Aeronautic Council (Consejo Superior de Aeronáutica) through a decree issued on 9 April 1927.

The newly created council existed to unify existing civil airlines which reflected General Primo de Rivera's policy of establishing state monopolies to run the country's essential public services.

[7] In May 1930 CLASSA made the first commercial flight to the Canary Islands using one of its Ford 4-AT trimotors, the only aircraft in the fleet with a radio.