Flight to Nowhere (1946)
Chosen form a list of public domain movies.
Fairly lacklustre mystery/spy thriller filled with silly red herrings and perhaps deliberate jokes (the main character - Hobe Carrington, is repeatedly knocked out).
It's ludicrously complicated, never have five people on a plane had so many different ways of trying to sell or deal with the same bit of information but shoves it all into about 75 minutes and manages some fun.
