Based on

Movies like Ships with Wings (1941)

Before the war, a Fleet Air Arm pilot is dismissed for causing the death of a colleague. Working for a small Greek airline when the Germans invade Greece, he gets a chance to redeem himself and rejoin his old unit on a British carrier. This is regarded the last of the conventional, rather stiff 1930's style Ealing war films, to be succeeded by much more realism and better storytelling.