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Line 10: Codes in the range QAA–QNZ are reserved for aeronautical use; QOA–QQZ for maritime use and QRA–QUZ for all services. "Q" '''has no official meaning''', but it is sometimes assigned a word with [[mnemonic]] value, such as "Queen" for example in QFE: Queen's field elevation, or "Query", "Question", or "reQuest".<ref>{{cite web \|url=http://www.boeing.com/commercial/aeromagazine/aero_16/polar_story.html \|title=Aero 16 – Polar Route Operations\|first=277808-Elizabeth A. \|last=Franklin \|access-date=5 September 2016}}</ref> ==Early development==

Q code: Difference between revisions