I have put together an AI Traffic file for an airport I just completed (Loring Int'l_ME16). It incorporates small and medium GA Spots, a few Cargo spots and several large GA spots. I ran the fault finder for the AFCAD (done in ADE) and found no faults. Loaded the sim (FSX) and was happy to see many default and custom aircraft parked or taxiing. However, lol, one J-3 Cub seems to have it's own taxi route which takes it out into the countryside and back again, always the same circuit. The commercial traffic (MD-83 and larger) want to bounce all over the taxiway on the way to the rwy. All medium and small aircraft seem fine, they taxi and take off as they should. Any idea what might be causing the errant behavior of the J-3 and the commercial jets? I used Airport AI Enhancer XP3D for the traffic work.