ER stands for Extended Range These aircraft types that is identified by 'ER' are aircraft models that is enhanced for better efficiency at long range flights than its counterpart aircraft of the same model. Source(s): Aerospace Engineer - Aviation Enthusiast
Actually Dusty.... The leeward side extends all the way to Koko Head (encompasssing Pearl Harbor, Honolulu to Hawaii Kai). By definition. Windward is the side of an island where the predominant wind travels from the sea onto the island. Leeward is the side of an island where the predominant wind travels from the interior of the island to the sea. In practice on Oahu.
The Leeward Islands make up the northern part of the Lesser Antilles chain. The Puerto Rican Virgin Islands contain two islands: Vieques and Culebra. Four of the islands that compose the U.S. Virgin Islands are St. Thomas, St. John, St. Croix and Water Island.