Originally Posted by
JJeffrey
Business Extra upgrades pull from the exact same inventory as miles/copay or SWU upgrades (C for business, A for first). They can clear at anytime from booking right up until the flight time. Your chances of clearing are going to depend entirely on the route, time, day, etc.
If you subscribe to ExpertFlyer you can search flights with C & A upgrade availability.
Business Extra ("ExtrAA") Program (master thread)
As long as they clear after SWUs (and who's going to be using an SWU for an 1100 mile domestic flight) I'll go ahead and get one of the upgrade certs and apply it. We'll see if it clears.