I seem to remember the story of the DC3 approaching Essendon in the good old days.
Said the flight was as good as finished and threw the flight plan out the Storm (DV)window.
Trouble was it went into the oil cooler and the engine oil temp became a real problem.
I think he might have had to feather it.??
Another of the same ilk had his flight plan forwarded to the airline by mail from a good citizen who had picked it up off the ground.