score:11
I have flown through Boston Logan many, many times, as I have family in Boston. I have carried tripod in its own case with me on multiple occasions - and never had any problems. This has been the case with both - my old cheap Β£15 tripod and my current rather expensive Manfrotto one.
Once or twice I was asked to open the case so that they could inspect it in details - after which they wished my a safe trip and let me go.