Why would you select the airport authorities instead of AA management? Considering the current AA philosophy of wringing the oil out of the peanuts and reselling it to save a penny, that would be a reasonable place to look for blame imho. AA bean counters somewhere have to cut a check to the Chilean government for taxes, and due to sloppy record keeping they can't find enough money in the ticket revenues, so the word goes out to airport staff to shake the difference out of the pax.