Through the airline's official website or by calling an agent at the American Airlines customer service hotline, travellers can make changes to their flight tickets online. People typically prefer the phone call technique to change their travel tickets because it feels more controllable and requires no effort on their part. Still, it is always advantageous to make the modifications online via the airline's official website if you phone during peak hours and are unable to speak with a customer service professional due to lengthy holds. Both methods are outlined for you here and are easy and quick.