Don’t the crew members do a check of the airplane after it lands, to make sure everyone has departed? I remember one time, I was in the next to last row, one of the last to deplane, and the flight attendants were doing a walk through, checking the overheads, and commenting to me that it looks like I was the last one on board.
Yes, they do and the cleaning crew get in there fast because planes must have a quick turn around for the next flight. The company loses money every minute a plane is parked.
Depends on the airlines. My mother suffered from memory loss at that time and was flying from my area, Seattle, to Spokane back to her home with my sister. Her illness wasn’t that bad as she occasionally wasn’t aware of the things around her. She was not bad enough not to handle an hour flight and my sister was waiting for her at Spokane. When she didn’t get off the aircraft, my sister called me and I told her she got on it as I was standing there watching. And the flight crew told me she was situated and comfortable.
My sister had them go back on to an empty aircraft and there she was, sipping a soft drink happy as a clam, no one around.
I had visions of Jerry Lewis as the bellboy as she was a small aircraft pilot when she had her facilities.
rwood