Le canard en fer blanc (1967)

A pilot gets busted in an imaginary South America country and is sentenced to death. He is saved from the fire squad by a bunch of so called revolutionaries. He's got to fly them to Santa Costa, another imaginary country, where a hidden pile of money will help them overthrow the tyrants and restore liberty and democracy. But some people of the group's motives are not as clear as they appear at first sight: money can't buy happiness, but it does help, so on the way to the promised land, a villain is slowly doing away with his mates.