While I was on a cruise in the Caribbean Sea, I was able to do some planespotting right from the ship in some exotic countries.
On Feb. 16th, 2024, I visited Castries on the island of Saint Lucia and saw the small airfield of SLU (Castries Airport). The arriving and departing cruise ships even pass right through the runway's final and have to communicate with the airport's tower to sail by... Certainly a very unusual and unknown airport.