There was a pilot at an airline that I shan't name who worked until retirement on false ID, that of a pilot who had retired to some remote island and had died there many years ago. It was unclear whether or not he was actually a qualified pilot, though the eventual revealing of his past suggests he probably was once qualified in some *cough* Greece *cough*
country, but he did know what he was doing and even used to Captain new frames home for his employer.
He was only rumbled after his recent death when several former colleagues attended his funeral and learned of his double life. I don't think it's public knowledge yet and don't know if it ever will be but if the story does pop up I'll see if I can get a friend to share more of the story. By all accounts he was a remarkable chap.
A million great ideas...