Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym 21N is...

21N is

  • Mattituck Airport, Mattituck, New York USA

21N is also in:

Acronym Definition Searched: GOTCHA LIP IBL URB WSBA LEJ RFO WJYM RBS TNT EAST VAQ-209 FSAU-S MU SEIP