I recently went on their website
http://tropicair.com/ and requested reservations for two passengers. Then I was contacted by email (
[email protected]) by a nice woman named Lizzet who faxed me a credit card payment form. We had an exchange of emails over 3 days, but we finally concluded our business by email and fax. I was actually buying tickets for someone else's travel next month. When I travel to San Pedro, I let the hotel make the reservations and add the cost to my bill. I'm just risk averse enough to need to have reservations, but Tropic Air seems to be very accommodating to anyone who needs a ride.