For all tickets purchased on and after Feb. 22, American Airlines will charge all customers, including those sitting in premium cabins, $50 for confirmed same-day changes on domestic and Canada flights.
Flyers with premium status previously were able to make same-day changes for free.
Premium customers (including those with elite frequent-flyer status), active U.S. military personnel and customers redeeming miles for AAnytime Awards travel can continue to standby for free. However, the standby option no longer will be available to most coach passengers.
The changes apply to American Eagle and AmericanConnection flights, too.
Source: CanFlyer