As of a few days ago, 1B6 is now
CLSD TO TRANSIENT
This is the NOTAM which appears at https://notams.aim.faa.gov/notamSearch/nsapp.html?METHOD=DISPLAYBYICAOS&REPORTTYPE=RAW&FORMATTYPE=DOMESTIC&RETRIEVELOCID=1B6&ACTIONTYPE=NOTAMRETRIEVALBYICAOS#/details
!BDR 07/063 1B6 AD AP CLSD TO TRANSIENT 2207121715-PERM
I think the meaning is relatively clear-- don't land here unless you're based at this runway-- but if a pilot is held to a standard of obeying the NOTAM it would seem there should be an iron-clad definition of
Is there a legal definition of
TRANSIENT in the NOTAMs?