I just had a trip ticketed on UA. Outbound was UA/UAX and return was UAX/CO/CO metal. Mileage Plus (1K) number was used.
The outbound upgrade cleared as usual. The return on CO was not even put on the EUA upgrade list. They had to do it at the airport and I was #16 out of 66 by then. (I doubt I would have been upgraded anyway even if I was cleared in advance.)
Does anyone know what went wrong? EUA should have worked in this case, right?
Thanks.