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Old 20th February 2009 | 18:57
  #1623 (permalink)  
Captain Airclues
Just another number
 
Joined: Jun 2001
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From: UK
The double digit method is only used by air carriers and commuter airlines using FAA approved callsigns, for example "United thirty one, sixty". All other aircraft should use single digits for example "Cessna three one six zero.

See Section 2, 2-4-2 (5)

Section 2. Radio Communications Phraseology and Techniques

Dave
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