Directed by Pete Burness and produced by Stephen Bosustow, When Magoo Flew won the 1955 Oscar for Short Subjects (Cartoons).
[4] Near-sighted Mr. Magoo goes to see a movie but instead mistakes the airport across the street for the theater and takes a seat on a departing airplane.
The man in the seat next to Magoo turns out to be a bank robber who flees without his briefcase (full of stolen money) when he sees a policeman talking with the stewardess.
Magoo politely tries to find the robber so he can return his briefcase, stepping out into what he believes is the theater lobby (actually the wing of the plane).
After startling many of the other passengers due to his apparent lack of concern of the danger to his life as he wanders on the outside of the plane, the pilot opens up the cargo bay door so Magoo can get back inside.