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Wikipedia definition
1. Aircraft registrationAn aircraft registration is a unique alphanumeric string that identifies a civil aircraft, in similar fashion to a licence plate on an automobile. In accordance with the Convention on International Civil Aviation all aircraft must be registered with a national aviation authority and they must carry proof of this registration in the form of a legal document called a Certificate of Registration at all times when in operation.
Read “Aircraft registration” on English Wikipedia
Read “機体記号” on Japanese Wikipedia
Read “Aircraft registration” on DBpedia

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