Originally Posted by
3Cforme
AA's standard for a free ticket change or refund is a schedule change of 90 minutes or more in departure or arrival. It has nothing to do with maintaining the same flight number.
This is incorrect. There is no time requirement on schedule changes. The only time it comes into play is if you want a refund. AA issues vouchers for changes of less than 90 minutes, over 90 minutes they go back to your FOP, most likely your credit card.