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.
Keel - The spine of a ship that runs from bow to stern at the lowest point. Lee (Leeward) - Direction the wind is blowing relative to the ship. The side of the ship opposite that of which the wind is coming from is known as the Lee side. Lighthouse - A tower used as an aid to navigation marking a hazard or point of entrance. Usually consisting of a very bright light atop a tower and often a foghorn or siren and radio beacon.