No fee since it's business class and you're only changing dates. Booking class is Z for first class, U business, T economy for AA.

On Cathay First is Z, Business is U, X for economy class.
You can look it up only if you specify these codes, you might try looking at a class below your ticket if you really need the date and would be willing to chance flying economy. You can then check periodically to see if business opened back up.

777brit posted a good summary of these booking class thingies someplace

[This message has been edited by benoit (edited 10-24-2003).]