Adding to the post from Shackman, my father who was in the RAF was posted to Malta from 1968 - 1971. One day we were meeting someone who was flying BEA from the UK and the aircraft was using Hal Far owing to runway resurfacing. Passengers were being bussed from Hal Far where presumably all ramp operations were undertaken to the civil terminal at Luqa. I don't know if the bus journey would have been entirely "airside" but security wasn't an issue in those days.