Thank you, but I trying to do the same with a flight that has "J"seats available and the agent tells me that there is no UPGRADE available for that flight.
Cheers
Could be worth to HUCA a few times, but this may be a married segments issue: sometimes you only get upgrade inventory in J on AAA-BBB-CCC and not on the individual segments. And sometimes only on the individual segments, but not the entire trip. I don’t understand it to be honest, but it’s an industry-wide standard.
Question: I remember reading somewhere that tou would need "X" class available to book upgrades . Can anyone confirm it ?
Upgrades definitely book into J, as Lefly just posted.
X is economy limited award
I is business limited award