I tried to withdraw cash from an ATM to pay my exit tax in San Pedro Sula. I was at the window where you pay the exit tax and went to two ATM machines to the left of the window. I tried to use the machine on the right and it just said that it did not have the denominations that I wanted. I then went to the window and simply paid with my card. A few days after I got home there was a charge on my card that pretty much emptied my checking account and the ATM withdraw was made in Monterrey, Mexico. I never went to Monterrey. I would advise against using the ATM's in the airport!