Originally Posted by
Cheetah_SA
It happened years ago to a passenger in F on a SA flight. Unfortunately for the culprit she was spotted by another passenger. Discretely reported to the Purser who told the pilot and police notified. Culprit caught with cash and travellers cheques.
The thief had seen the passenger stow the currency. She was a flight attendant!

I think that hiding cash in your overhead carry-on wouldn't be a big risk if you followed 2 simple commonsense rules:
1. Put the cash in the middle of the carry-on bag preferably wrapped in something not obvious like an envelope.
2. Don't let anyone see you do it so go to an airport toilet stall.