If you have to do this frequently, you can make it more convenient by adding a javascript bookmark to your browser.
In Firefox:
* Go to Bookmarks -> Show All Bookmarks
* Click on "Bookmarks Toolbar" under "All Bookmarks"
* Right-Click and select "Create New Bookmark"
* In the "Name" field, enter "Rename Reservation"
* In the "Location" field, copy and paste the code below
In Chrome:
* Go to "Bookmarks -> Bookmark Manager"
* Right-Click and select "Add Page"
* In the "Name" field, enter "Rename Reservation"
* In the "URL" field, copy and paste the code below
Now, whenever you want to rename a reservation, just go into it, select the bookmark like you would a normal bookmark, and enter the new name. When you go back to the list of reservations, it should be updated.
Code:
javascript:window.open("data:text/html,<center><b>Enter%20new%20name:</b><form%20method='get'%20action='https://www.aa.com/reservation/renameReservationSubmitAjax.do'><input%20name='reservationName'><input%20type='submit'%20value='Change'%20onclick='window.close()'></form></center>","rename","width=400,height=40");