Originally Posted by
aviators99
No, there's no waitlist, but if I'm on the same flight as you it won't work, because I type more quickly. ;-)
Seriously, the main risk is that their website is likely to go down in between.
But I get to choose when I cancel the First flight, and upgrade! It's not like the current upgrades where the is a "race" between people exactly 24 hours before the flight. Unless you constantly hit refresh during the 24 hours to catch me when I cancel my First class ticket, I'll have a huge edge over you!
I'd say if I do this at a random time, the chance of anyone preempting me is tiny. And even if it does happen, I still haven't lost any money.