Wendover Productions has a video on how airlines are banks now. Their Loyalty Programs are worth several times more than the Airlines and flying is basically a secondary business for them.
How Airlines Quietly Became Banks
How Airlines Quietly Became Banks
"If you want to be a millionaire, start with a billion dollars and launch a new airline." - Richard Branson
That seems like an interesting topic. Wasn't Wendower Productions just reading Wikipedia articles over stock footage and blueprint graphs? Or am I mistaking that with some other channel(s)?
edit: Well that was easy to search for, it was Real Engineering channel.