I am a frequent traveler to Costa Rica and about a month or so after my trip a fee occasionally appears on my credit/debit card: SERV.AEREOS NACION with a purchase number and San Jose Costa Rica. It is a B of A card. I am VERY conscious about where I use my credit/debit card. In fact I only use it at the ATM’s to take out money. I never rent cars, do not stay in hotels and rarely do tours and when I do I use cash and pay for food in cash. I occasionally use it to pay for my $26 exit tax and that is it. I called my bank and they can not provide the details on exactly where this charge is coming from. I have been to CR 6 times this year and have only received this fee after 3 of them. The fees are about $60 and the problem is they occur 1 month after the trip so I can not remember exactly which bank I used to withdrawal money from. If anyone who lives in CR or has been traveling there for a number of years could shed some light I would greatly appreciate it. Thanks.