Hey, all I'm aware that there's no fee to change an AA award if all you're changing is the dates. Does that hold true if you're also changing the CLASS of service? Example: I book an award on AA from ORD to HNL in coach because there's nothing available in business. If space opens up in business, can I change the award I booked for the difference between the coach and business redemption, or is there some additional fee or penalty? Thanks.