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Thread: Delta DM experience flying China Eastern
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Old Mar 7, 2017, 5:39 am
  #65  
PayItForward
 
Join Date: Mar 2015
Posts: 1,989
Originally Posted by moondog
Cardinal rule?
Means basic / fundemental rule.

https://en.m.wiktionary.org/wiki/cardinal_rule


On commercial flights, smoking is not allowed. It is a basic rule.
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