The mystery plane is transiting through here on ZBW 134.950 direct TAFFY at 1726z. Pics of it on airliners.net show it as an all white B-757 with COMCO on the tail. Reg # N610G This is what flightaware says about it: L 3 CAPITAL LLC (HELENA MT) This flight is not available for tracking per request from the owner/operator Ed Langworthy Scarborough, ME