HiThere are 2 sliders under trafficthe bottom one is general avaiation traffic density and the top one is airline traffic density.I have traffic X loaded as well.If I slider the airline density to 100% lot more parked planes are visable.If I take theairline density back down to 50% and increase the general av. density to 100% I don't see any difference, what does the bottom slider do then?

The bottom sliders is all about smaller aircraft: maybe you don't see a difference because they are not supposed to be parked where you are. When you are at a big airliner airport, you won't see many small GA. If you go to a small airfield in the middle of nowhere, you will probably experience the opposite: you'll only see small aircraft and no airliner at ALL, even with the airliner slider at 100%.It's also possible that Traffic X takes priority somewhere: don't know because I don't own Traffic X.