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Old 21st May 2008, 08:08
  #93 (permalink)  
Join Date: Oct 2005
Location: USA
Posts: 3,218
A few business aircraft cruise up to FL510, but most remain at or below FL410. Operating above those altitudes is an option for non-RVSM equipment, and aircraft wishing to avoid both weather and most of the other traffic. A lot more direct clearances above FL410.
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