From what I've been reading, it pays to volunteer to be bumped. Better chance at op upgrades and those lovely vouchers.

I always pictured myself volunteering (haven't done it yet) at the gate. So, my chance is coming up to, at least, volunteer - don't know that I have the best chance for being bumped. Does anyone know if the gate is where it must be done or can it be done from the check-in counter, or the AC lounge?

And, uh, what about saying something on the phone, just after getting ticketed? Does AA frown on those who actually want to get bumped?