I have a feeling that if the ticket was purchased by an individual who is not an active employee AA would be remiss if they divulged the form of payment. They may only be required to say the balance was used. I'd suspect that some travel department may not want to alter the former employees personnel file to read that they embezzled a dime. Far too much liability.

As a former long term EXP in 20 years in corporate America I don't believe I ever filed a totally 100% accurate expense report. Two weeks trips through multiple countries and currencies has a way of doing that.