Do 500 mile upgrades expire?
Do the AA 500-mile upgrades expire (either in the same year or some amount of time after deposited into your account if not used) ? Or do they stay there forever if not used?
And do the same rules apply to all, since you can earn them by flying or buy them from AA...?
Does not say on my upgrades page on AA.com if the upgrades in my account have an expiration date...