There's a thread from me on here a while back about AA butt fucking me trying to come back to Panama from the US.
They refused to let me fly without a return ticket, something that 4 other airlines on 12 other flights never had a problem with. I had to cough up $1100 at the gate for a return flight that I couldn't use and then they had the gall to TRY and tell me that they wouldn't refund it after the manager at the gate swore that he was selling me a "completely refundable ticket".
American Airlines