Originally Posted by
Tchiowa
...No bait and switch fraud.
If you buy a ticket for first class on a 2 class plane and IRROPS requires them to put you on another flight or another plane that has 3 classes your fare might only qualify you for business on the 3 class plane...
As if that was the problem
.
The comments above imply that it happens with some regularity and that it's deliberate ("fraudulent", "practices", "a lot"). I'd really like to read about it.
Selling First class rides and then claiming that they were upgrades predates the UA=>CO metamorphosis. It happened to me in 2011 but I did not post about it as I refused to take the flight. GA threw quite a fit which was funny.