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DOMESTIC AIRSPACE- Airspace which overlies the continental land mass of the United States plus Hawaii and U.S. possessions. Domestic airspace extends to 12 miles offshore.
Only RVSM-qualified airplanes may travel between 28,000 and 41,000 feet in domestic airspace. Cruising speeds are at a constant mach number, often about 82 percent of the speed of sound.
miles of horizontal radar separation or 1,000 feet of vertical separation. In certain oceanic airspace, vertical separation has been reduced to 1,000 feet at altitudes above 29,000 feet. Eventually, this reduction will follow in domestic airspace as ...
 See also: Wind, Direct, Controller, Service, Air traffic
  
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