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Thread: Is there any logic behind the yyy number in the 7x7-yyy format
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Old Nov 28, 2011 | 9:18 am
  #4  
BamaDude
 
Join Date: Jul 2007
Location: BHM
Programs: AAdvantage
Posts: 83
Originally Posted by BearX220
Here are all the codes listed for you:

http://www.airlinecodes.co.uk/boeing.asp

Hence a Boeing 747-438 was a 400 series 747 delivered to Qantas, a Boeing 707-321 was a 300 series 707 delivered to Pan Am, etc.
To expand on that a bit further, the customer codes indicate the layout and options with which the aircraft was originally built, including number and location of lavatories, number and location of galleys, engine type and manufacturer, etc.
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