Princess Juliana International Airport (TNCM) on the Dutch side is world famous for its placement. Heavy long-haul jets, in particular the Boeing 747, are passing the crowded Maho Beach at low altitude just seconds before touchdown at runway 09.
Beyond multiple local and American destinations the airport also serves European destinations as of the historical connections with Europe.
Saint Barthélemy (or Saint Barth) island is an overseas collectivity of France and is located about 15 nm south-east of Saint Martin.
Especially landing on runway 10 at Saint Barthélemy Airport (TFFJ) is difficult. First you must pass a hillside close to the runway threshold, then you have only 2400 ft of runway for braking with water on the opposite threshold. Take-off from runway 28 is prohibited.
The airport is served by multiple airlines with St. Martin as the main link.
Approach and landing chart is available in the AIP France. The airport has no instrument approaches.
Juancho E. Yrausquin Airport (TNCS, SABA in FS) on Saba has a 1300 ft short runway which is claimed to be the world's shortest runway for commercial flights. At both runway thresholds there are cliffs dropping into the sea. If you've ever wanted to try an aircraft carrier takeoff this would be the place :-) The airport has no instrument approaches.
Winair is the only airline that has scheduled flights to Saba.
The default scenery of St. Martin island is highly detailed with Princess Juliana Airport being a high-detail airport. Unfortunately the terrain surrounding the airports of St. Barthélemy and Saba are very inaccurate, so add-ons are highly recommended.
These add-ons for FSX improves the scenery of the three islands:
The DHC-6 Twin Otter is a common aircraft for scheduled traffic between the islands, especially because it's designed for operations on short runways:
Mission and reward
The FSX mission Caribbean Landing lets you fly a straight-in visual approach and landing for runway 09. You'll earn the Layover in Paradise reward for completing the mission.
The local airline, Winair, has scheduled flights between many of the local islands, with St. Martin as the base airport. A typical Winair flight is flown in the DHC-6 Twin Otter starting from St. Martin, then stop at two islands, and finally return to St. Martin (Winair route network).
Here is a short flight plan of a flight TNCM - TNCS - TFFJ - TNCM. The typical Winair block-to-block time from one of the islands to another is 15-20 minutes.