Nope, the Comenity fee waiver for a single no-fee change to paid tickets does not exist at AS.
However if you see a fare reduction you can get an airfare credit for the fare difference that you can use on another flight. So it's not all bad news...
WN is the only other airlines that offers no change fees on revenue tickets. Though this is of less value as travel dates approach, since you usually get socked with a higher fare on the new flight.