Fly! by Terminal Reality is very good for IFR training. It even has nice graphics. The good things are that nearly every switch in the cockpit works (the odd one or two don't), and the weather and flight phyisics are very accurate. I tried to land an ice covered Piper Malibu at an aerodrome with 6000'ish feet elevation. Did it!!....just
PSP 1.3 (that famous 744 sim) is great for FMC trainging (has about 95% of the pegasus operations).
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Eat My Vapour Trail