Originally Posted by flymeAAway

Agree as gold he can standby for free. However, in this situation the terms and conditions state you can not standby for a later flight:

"AAdvantage regular members and non-members using same-day standby may only stand by for an earlier flight."

Since OP is gold, status will not get him a free Same-Day Flight change unless:

"Get a complimentary same-day confirmed flight change with:

Unrestricted Economy Class (Y fare), Business or First Class tickets
American Airlines AAdvantage® Executive Platinum status and companions in same record
-AirPass® membership
-First and Business Class award tickets
-MileSAAver® & AAnytime® award tickets
-Choice Plus fares"