Break in the Circle (1955)

Directed by Val Guest, Break in the Circle stars Forrest Tucker in a Cold War-era thriller about an American pilot recruited into an international aircraft smuggling operation. Based on Monica Curtis's novel The Aircraft Treason, the film follows a network involved in the illegal transfer of military aircraft across international borders. Combining aviation, espionage and crime elements, the story unfolds against the backdrop of post-war political tensions and international intrigue.

Från IMDB:
An adventurer is hired by a German millionaire to help a Polish scientist escape to the West.