Well, this has got lots of small bits & pieces of intricate details I was anticipating to read about. I will note her tail next time to confirm it is a G2, from another spotter I got to know that she had been running her 2nd or 3rd t/o that day hauling Superbowl traffic. I was wondering how a modern jet like a Gulfstream could put out so much black smoke, when I see B744 & MD11's not doing this during heavy t/o's.