just a word of caution to check "my itineraries" after you request your upgrades. twice in the last week i have bought tickets and requested upgrades, only to find later on that i was waitlisted on the wrong flight.

first i got waitlisted for upgrad on ua958 when i was traveling on ua928!

then i got waitlisted for upgrades on ua838 and ua852 on the 20th of december when i was travelling on another date.

the danger it would seem that if you didn't figure it out until you got to the airport, you might find yourself on the bottom of the waitlist, or worse find the waitlist was closed altogether...so check check check :-)

adam