I don't even bother with a letter (granted, I don't live/work in the US), but I've been visiting the US as 'F' but appear at 'M' since 2004.
Never get questioned about my gender marker. Ever... not even when I was almost not allowed in last time.
Maybe one day they'll do full cavity searches..
I'll just make sure I've washed that day.
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-PapaC 
aka bootstraptechguy
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