Twitter Archive | December 21, 2017 | In December 1947, the three-letter code “SFO” first...

@SFOMuseum Twitter Posts This is SFO Museum's archive of the @SFOMuseum Twitter account.

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In December 1947, the three-letter code “SFO” first appeared in the American Aviation Air Traffic Guide. Read more about the story behind #SFO's three letter code on Facebook: https://t.co/WEWE11SZuL #ThrowbackThursday #SFOhistory . This tweet was posted on December 21, 2017.