If you have a different flight coming up another option is to put it on hold the night before then while at the airport have it ticketed there. Give yourself extra time if you do this, last week I did this and they had to find the 1 rep who knew how to do it but it saved me from mailing something, which would entail finding a stamp and envelope. It would be nice if AA joined DL and UA in the 21st century and allowed these to be used online but as suggested I’d bet the breakage they get on them makes it low on the priority list