I joined FT many years ago at the suggestion of a work colleague. At the time I was doing YOW-IAD-YOW about twice per month. The only choice of a/c on that route was the CRJ (I sill have a crick in my neck), and those of you familiar with it will know where 13F is situated.
I didn't put a lot of thought into my handle at the time, but I do find typing my full name a bit awkward which is why I sign my posts 13F instead of Seat13F_AC_CRJ. Perhaps I'll get around to asking for a shorter handle some day.
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13F