Originally Posted by tom911
You'll likely need to call AA:
Phone: United Kingdom
Inside London:
020-7365-0777
Outside London:
0845-7789-789
07:00 - 19:00 Mon-Fri
08:30 - 17:00 Sat-Sun
Maybe UA will endorse your ticket over to AA if they're full? I'd ask about that.
Thanks for the suggestion and quick response! I really appreciate it.