See topic title. I must be blind, but I really can't find the option.

It's the Aircraft Cast shadows option.

and you're running the dx10 variant right?

Aircraft shadows are on and so is DX10 preview. Maybe it only works with specific aircraft (the new ones)? I gave the new heli and the jet a try but I didn't see any shadows...

I can't remember but is it Aircraft shadows or Aircraft casts shadows on itself? That's checked?Try flying towards the sun at about 2 hours after dawn in the Maule and look behind at the seats, anything? All the default aircraft I have tried have shadows, can't think of anything else that would not allow them to appear.