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 نحوهٔ چینش اطلاعات:
 
 The prefix is reserved for Australia. For many (but not all) Australian ICAO codes, the second letter indicates which (FIR) the airport belongs to — Brisbane, Sydney, Melbourne and Perth. However, the Sydney and Perth FIRs no longer exist and have been merged into the Brisbane and Melbourne FIRs, although the airport codes remain unchanged (e.g. Sydney YSSY, Darwin YPDN).
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