I am an entertainer and a promoter purchased a first class ticket on AA for me to travel within the USA with their credit card and 3 months later I am being billed due to fraud. According to AA the promoter used a stolen credit card. The ticket was bought in a South American travel agency. I had no knowledge. What are my rights and liabilities?
A standard disclaimer first: we cannot give any legal advice - for any legal advice you must consult an attorney licensed to practice law within the jurisdiction of where the issue arose (in this case, USA).
That out of the way, the main thing to note is that you are the passenger - and hence the customer of the airline - and consequently are liable to hold a valid ticket for travel. The fact that another party purchased a ticket for you is irrelevant, as the airline doesn't care who purchased the ticket, all they care is that the passenger holds a valid ticket.
In your case, when the airline received a charge-back for the original ticket, they will want to recover their costs - and the only way to do so is to go after the one party that they are aware of - the passenger. From their point of view, you, the passenger, are liable for their losses, because you receive the service they provide.
Naturally, you are unhappy about this situation, but that's a matter between you and the third party (the promoter in your case). You can try to recover your costs from the promoter - either directly or via a court - although that may prove problematic if you are in the USA and the promoter is an alleged criminal using stolen credit cards in South America.