Originally Posted by
DeaconFlyer
If United sold you a fare marked as First class - they have a legal right to honor that contract. Next time you talk to a supervisor, mention the DOT reg 399.88(a).
“The seller of the air transportation cannot increase the price of that air transportation to that consumer, even when the fare is a “mistake.’’’
Wrong. UA will simply laugh at you. The rule applies only to "tickets" and this was not ticketed in F. As it turns out, there isn't even F on the aircraft. OP has been offered the upgraded cabin at the price difference, but doesn't have to accept it.
OP can file w. DOT, but he'll still be sitting in a coach seat on his flight, UA will fight this issue and it will win and that's only if DOT pursues it.