Editing Minimum en route altitude (section)

==Overview==
The MEA prescribed for a Federal [[Airway (aviation)|airway]] or segment, [[RNAV]] low or high route, or other direct route applies to the entire width of the airway, segment, or route.  MEAs for routes wholly contained within [[controlled airspace]] normally provide a buffer above the floor of controlled airspace consisting of at least 300 feet within transition areas and 500 feet within [[Control area (aviation)|control areas]].  MEAs are established based upon obstacle clearance over terrain and man-made objects, adequacy of navigation facility performance, and communications requirements, although adequate communication at the MEA is not guaranteed.  The MEA does, however, assure acceptable navigational signal coverage and meets obstacle clearance requirements between those fixes.<ref>{{cite book|title=Pilot/Controller Glossary 2012}}</ref>