Mad Dogs and Servicemen - S3-E13
Frank: Corporal Travis, Richard. To Tokyo. Typical psycho case, shell shock.
Trapper: Frank, that's straight outta World War One! Nobody thinks shell shock anymore.
Frank: Oh, what's the diff? Too much action gets them in the old brain box; makes even the best soldier gaga.
Trapper: Frank, I defy you to show me a medical book that lists the word 'gaga'.
Answer: The C-42 was a military variant of the Douglas DC-2. Very few C-42's were built, so it's questionable that Potter would specifically have seen that particular model, but, given his military background, it's not entirely unreasonable that he might use the military designation even when the aircraft in question is actually a civilian DC-2.
Tailkinker ★