Originally Posted by
ROBEAR
It really depends on the staff at the desk....and the metal being flown.
I would print the original itinerary off the continental website so they see all the continental information/flight number/record locater/etc. You might have less issues versus showing them a boarding pass with United all over it
It's more complicated than that. AMEX is the one who gets charged for the access. According to the contract between AMEX and CO, only CO metal qualifies for CO being compensated. A PC receptionist letting one in on a UA plane and then charging AMEX for access would be basically fraud. If they decide to let the OP in, CO would ethically have to eat the AMEX access fee and not bill AMEX. Channa's suggestion to switch to a CO flight is the way to go to be sure.
And you have to show a boarding pass w/ your AMEX card to get in, not an itiniery.
I bet more of this comes up before the AMEX deal expires as we see more UA flights in/out of CO hubs. UA between ATL and IAH wouldn't have happened pre-merger.