Join Date: May 1998
Location: Reno, NV (RNO)
Programs: AA LT Platinum, AS, UA Premier Silver, DL, HHonors Gold, Marriott LT Titanium, Hyatt, IHG Platinum
Posts: 4,723
I believe US Air permits upgrades on award tickets, but only at the gate and no more than 2 hours before departure. Maybe some of the US Air experts can confirm this.