Originally Posted by
happyvoid
Does american airlines charge a fee to upgrade my AAdvantage award tickets?
I booked a direct flight from Tokyo to LAX. I am not able to get business class seats now. I booked with AA miles. Can I book Saver economy class now and once there is opening upgrade to business class or first class saver seats by paying the difference in miles without any additional fees?
Yep, exactly as you said. Book economy now, if business or first opens up later, just call AA and pay the additional miles but no fee.