What is the title of a movie from late or early about pirate radio station flying in WW2 era bomber?

You're likely thinking of the 1988 movie "The Adventures of Baron Munchausen".

In this film, a fictionalized version of the real-life Baron Munchausen (played by John Neville) tells incredible tales, one of which involves him broadcasting from a converted B-17 bomber during World War II. This scene is memorable for its wild, surreal tone and the sheer absurdity of the idea.

Let me know if you have any other movie mysteries!