Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym 5N9 is...

5N9 is

  • Montauk Seaplane Base, Montauk, New York USA

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Acronym Definition Searched: WXYB EO 53154 TM DIS JSW 64456 68767 68501 V CFA GSS 24714 VZU 81140