YYZ-CUN upgrade on a AE ticket for my brother. He accepted the $199.00 fee.
Also saw a group of four upgrade at the ckin desk on my return from CUN with a hand full of money. I fortunately got to ckin just after and snagged the last J seat with a SSWU from my tango plus fare, took the seat away from a couple of guys travelling at the ckin desk beside me.