What film is this? ?

Question

An old black and white film. The cast is trapped in a prison. They escape using hang gliders at the end, and if I remember correctly, they use a stage production to cover up the making of their hang glider from the guards. Mostly male cast. 

That's all I can remember. If anybody can tell me what film this is, I'd be super grateful. 

Answer 1

Those movies already listed sound like the movie you're looking for but those movies are in color. The Colditz Story (1955) is in black & white, however, it's an accurate version of one of the many escapes from Colditz during WW2. Two prisoners did build a glider there but the war ended before they used it. Here's an actual photo of the glider.

https://en.wikipedia.org/wiki/Attempts_to_escape_Oflag_IV-C#The_%22Colditz_Cock%22_glider

Answer 2

This true story has been made a number of times:

Escape of the Birdmen (1971)

Escape from Colditz (1974)

Escape from Colditz (2012)

Answer 3

Escape of the Birdmen