Originally Posted by
mtofell
At the security checkpoint would be the most practical place to regulate size.
No, this won't work. It was actually tried for a while a number of years ago - there were sizers built onto the entrance of the bag x-ray machines, so anything larger than "approved" wouldn't even fit through. They didn't last all that long.
The main problem is that different airlines have different size limits. Even the same airline can have different size limits - I believe B6 uses a smaller size for its E190s which have smaller bins. So TSA can't really enforce multiple regulations.
What they really need to do is have kiosks where you scan your BP, put your bag in a sizer, and if it meets the requirements, it spits out a bag tag that has the date and flight number in big text, and this needs to be visible on ANY bag put in the overhead. That's probably an unrealistic investment in IT and machinery; they could have gate agents effectively do the same, but that's an investment in labor.