Originally Posted by
UA-NYC
Talking with my CO Plat co-worker, he thought that me calling in to get my mileage UGs cleared (still curious why that didn't happen automatically with R available - what's the definitive word on expiring mileage UGs inside T-24?) might have triggered the EUA run. If that's the case, my diligence maybe got a whole lot of people upgraded early as opposed to at the gate.
You really are trying to ask more questions to make it confusing aren't you?
Inside 24 hours, from what I know, EUA runs dynamically. Which means that when someone checks in for the flight, EUA is triggered to run. If there is no R available, then no one gets upgraded. In your case where you saw R available, the next person to check in would trigger EUA to run and since R space is available, those people would be upgraded. As for your question about expiring mileage upgrades, they used to never be included in EUA runs during T-24. However, I remember
UA Insider mentioning that they were working on a fix to include so that when a mileage upgrade waitlist expires, those passengers are still included in the EUA runs that occur from T-24 to departure.