Originally Posted by
GinFizz
Edit: Just noticed you mention this is a BA Holidays booking. That may make things a bit more tortuous. Probably worth calling AA directly to ask, though you may be told that you need to go through the travel agent (BA Hols) for any re-scheduling requests.
I spoke to BA Holidays to fix a AA schedules change last week and it was very straightforward. The member of staff gave me the impression they are doing a lot of AA metal changes at the moment and were well used to it. Obviously YMMV.