- Nothing to do with stickers necessarily. If CO went to an AA-like system where status is the primary driver of upgrades as opposed to fareclass, then a Plat wouldn't have to worry that a Gold can bypass him by purchasing a ticket 3 days before the flight. Now, using stickers would help in so far as everyone would not opt to upgrade each leg (would have to be more selective), or at least they would have to pay for it. That will result in higher upgrade percentages for sure.

- IMO, the 24 hour sweeps haven't done much. The problem is that CO still holds back generous amounts of seats at 24 hours on the routes that count, so a sweep is only a good as the number of seats it gives out at that point. Granted, I have not flown since April or May, so things might have really changed in the last few months. I defer to you for that judgement. I will fly with them a lot starting in September, lasting through the end of the year, so I should get a pretty good picture soon.