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Old Feb 9, 2007 | 10:29 pm
  #37  
LarryJ
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Originally Posted by nnn
Thus, FL170, FL160, etc., are assignable altitudes in the United States.
They are not. FL180 is the lowest flight level that can be assigned in the US. If FL180 is below 18,000' MSL due to low pressure then FL180 is not assignable.
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