Originally Posted by
fastair
"That's no problem, let me see your onward boarding passes or itinerary so we can check it..." That will usually show the person is lying and he will quickly surrender his bag as being a person of untruths. Once proven to be a liar, the fight is usually taken out of a person. Oh, and SU allows a total of 10kg for Y class passengers...your bag is too heavy to be carry on for them, so we will just check it to the gateway so you can reclaim it and check it in with them/pay the fees.
I think you're putting way too much faith in the mental capacity of the GA. In this scenario the GA already started with the "untruths" and lying:
The agent singled me out and insisted to check my bag to destination. After arguing uselessly she insisted there was no way my bag would miss my connection. So here I sit watching open bin space go unused and plethora of larger carryons being loaded.
So their should be no fight left in the "liar" GA at this point.