rehan

Thanks for explanation. I thought it was the problem with versions. Anyway the tutorial is great no matter the contrails! Thank you very much.

Sorry for bumping old thread.. I have downloaded the tutorial and it's great! Thanks for that. I have one problem though. There is a reference to missile contrails (SAM's) in the tutorial. I don't see any contrails from SAM missiles at all (I do see my missiles contrails). Is there something wrong with my LockOn? (I use 1.12a)

This is true only in US and some part of Canada. Transition altitude in Europe varies. Transition level might be as low as FL40 in some places. Below lowest possible FL (which is TL) you fly using QNH and report true above sea level altitude usually described in feet. Above TL you fly using 29.92 and this is when you report your altitude to ATC using FL instead of feet. FL is mostly used for safety issues. When and why you report to ATC in general depends on the airspace you are flying, your flight plan, etc.. but indeed in US class A airspace starts at 18000 feet (change your alitmeter to std pressure 29.92) and you can't fly VFR in class A - IFR must fill flight plan and communicate with ATC. Sorry for little offtopic, I don't know is altimeter calibration is used in LockOn (but I think I saw it while watching SU25T demo video), I am pretty new to this sim.