Well first of all AA sucks, now that I have said that.
I have never had a gate agent with AA have the authority to issue vouchers. Every single time you have to wait in "customer service" (oxymoron if there ever was one) and get in queue with 20 other people who are all also unhappy. Last time it took almost 20 minutes for them to process giving me vouchers, which I think would be a simple transaction. Never have I seen so much key punching and thinking..... I could have bought the whole damn thing online in less time. Not to mention the taxi voucher they give, the driver wouldn't accept it, I about lost my sh** with that one, luckily another driver took it as I was about to call somebody and make a hell of a scene. I am reasonably sure the terms of carriage of allowing the cabs into for pickups require them to pick anybody up. AA sucks.