The "operating carrier" is the airline that actually flies the plane. It also determines where you check in and board, so it's important for you to know who operates your flight before you travel. You can find which airline is operating your flight:
While we work toward building the new American, you may continue to purchase air travel on both carriers, so be sure to check who is operating your first flight before you leave for the airport to ensure you know which terminal to go to and which airline's fare rules and fees apply.
If you have additional questions, please contact us for assistance.