No (but AA phone reps sometimes make exceptions. As an EXP, I'm batting 100% on the exceptions).

Sad...as CO, NW, and UA have 24-hr refund on MOST tickets. Read the fare rules. Some NW tickets are not 24-hr refundable.

Sometimes even upto 48 hrs you can refund if you get help (but before 24 hrs is MUCH easier than after 24 hrs)