Originally Posted by
Ebes1099
This seems odd to me, if you check a bag and then never scan your boarding pass to get on the plane it would be clear as day to the GA that you hadn't boarded and I would guess pretty easy for them to locate your bag and remove it from the flight. That seems like a huge security risk (especially this day in age) to allow people to check bags and never board the flight so the bag flies without them.
It is not the rule on US domestic flights. I don't know the current international rule, although my memory is that the rules are different there.