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
exists and is an alternate of . The difference is that windward gets more rain, is wetter, and is the side of the mountain that is closest to the ocean. On the other hand the leeward is the farthest from shore and is drier but still gets rain.
Sometimes the synonyms downwind (same as leeward) and upwind (same as windward) are used instead. They are also widely used on the islands of Hawaii to give directions or describe locations. The tropics on earth have pretty constant east-ish winds, caused by solar heating and the rotation of the earth.