The fees charged by St Maarten when exiting the island are now 3 separate amounts totaling $52.41 .
There is a "Passenger Screening Fee" = $10.91 An "Airport Improvement Fee" = $5.50 (this is the most recent fee, new in 2017) And the "Airport Departure Tax" = $36.00
They charge no fees to US Airline passengers on your arrival ticket.