Originally Posted by
swag
Of course.
Go to
https://www.aa.com/reservation/viewR...tionsAccess.do. Log in as needed. All trips associated with your AAdvantage number are listed.
If you don't have an AAdvantage number, or if it's not attached to the reservation, scroll down on the login screen and "Continue without logging in", then look up the reservation that way.
Select the reservation. The lower right corner of the flight info box should have a link "change seats".
That is where I was looking but I don't have that option.