{American Airline }What is the penalty for cancelling a flight on American Airlines?{AA-USA} What is the penalty for cancelling a flight on American Airlines? If your departure is at least two days away, American Airlines grants cancellations with full refunds within 24 hours of booking +????-????????????//????????????//????????.???????? You can cancel or make changes to non-refundable tickets without incurring fees, but you will receive a travel credit rather than a refund.+????-????????????//????????????//????????????????.