| Airway (aviation) |
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In the United States low altitude airways (below 18,000 feet MSL) appear on sectional and world aeronatical charts and are designated by the letter "V" (pronounced ''Victor'', hence ''Victor airways''). High alititude airways (above 18,000 MSL), called jetways, appear on high altitude charts (that usually don't show topography as the low altitude charts do) and are designated by the letter "J". In the UK, Airways are corridors 10 Nautical Mile s wide of class A Controlled Airspace with a defined lower base, extending to FL245. They link the major airports giving protection to IFR flights during the climb and descent phases, and often for non-jet aircraft, cruise phases of flight. Historically they were laid out between VOR s, however advances in navigational technology mean that nowadays this is not always the case. Like roads, each airway has a designator containing one letter and one to three numbers. All airspace above FL245 is class B controlled airspace, the equivalent to airways being called Upper Air Routes and have designators prefixed with a U. If an upper air route follows the same track as an airway its designator will be indentical to the airway, prefixed with a U. |
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