It used to be cell phones...
But I have personally left my glasses on an airplane before...
My wife and I went to Florida for vacation. I had the window seat and it was sunny, so I switched to my sunglasses.
I missed my carry-on bag with my glasses case and they landed on the floor beside my bag. I didn't realize this until we got to our condo on Marco Island!
I called the station at KRSW, but by this time, the aircraft had departed KRSW for KACY...
But they said they would make contact with the crew once the airplane arrived in KACY.
The cabin crew found my glasses when they got to KACY.
But it would be tomorrow before that aircraft was to be back thru KRSW.
The Captain had my glasses in the cockpit and said he would make sure they got to the ticket counter in KRSW.
The following day, my wife and I took the drive up to KRSW and got there just as the flight from KACY arrived at it's gate...and a few minutes later, my eye glasses case with my glasses were deliverd to the ticket counter by the Captain himself!