I love a good aviation mystery. And I have another one that has appeared on my and other Mode-S/ADB boxes/ So here goes ---
Airframe in FAA database is a reserved assignment by Dynamic AvLease. This company has been associated with some interesting aircraft (see http://www.jetphotos.net/showphotos.php?airline=Dynamic%20Avlease)
So who is flying this aircraft, what is its mission and what kind of aircraft is it?