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Old Nov 4, 2006 | 6:53 pm
  #18  
christep
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I've never managed to find an "official" document online that simply defines them. But there are many pages on various sites which illustrate it. For example: http://www.jal.co.jp/en/jalcargo/inter/map/

Page 10 of this document, which is on teh IATA website, also defines them:
http://www.iata.org/NR/rdonlyres/DF0...0/Section3.pdf
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