Announced just a few days ago, Soarfly Concepts said they were bringing Barra Airport to both FSX/P3D. The Scottish airport is unique in that the runway is on a beach, which can only be used when the tide is out. The unique airport sees Twin-Otters visit multiple times a day with short flights to and from Glasgow airport on the mainland.
You can download the airport free of charge via Simviation or via the developer’s website. On Soarfly Concept’s website, the scenery is charged at £2.00, but you can reduce that to zero by using coupon code “Freeware1“.