Alan
AD1BC4 seems to be LN-FTH miscoding it's former code of N9438G.
LN-FTH, Cessna 172S, c/n 172S11200, Pilot Flyskole AS
Also 51109D is now using c/s NVD501/NVD503 (Avion Express) and seen twice a day, guessing it's a Saab 340 or JS31, I'm trying to get the identity resolved...
Niklas