For those of you who have AI Concordes, how high do you fly them? I believe I read that FS9 doesn't have the altitude restrictions that previous versions did, but can you fly your Concordes at 60,000 ft??

Yes and no.It will be generated at that altitude enroute.It is doubtful that it could ever climb to that altitude - but the flight dynamics might be significantly overpowered from the real thing - which climbed at 200-300 FPM when high.The real issue will be landing. Too high cruise altitude is a major reason people see AI aircraft popup at the gate.The Concorde will be initialized about 100 nm from it's destination at FL600. It will be given a descent altitude - and will start descending at 1500 fpm. Approx 50-60 nm from the airport - the initial approach waypoint will be assigned with a target altitude.That target altitude will normally be about 7-10,000 ft AGL and will be 20-25 miles from the airport.Since your Concorde has descended only about 10-12,000 ft - it will now have to descend 38,000 ft in less than 40 nm.As it tries to make the target altitude the descent rates will be very high - 7,000-15,000 fpm. Most AI aircraft flight dynamics fail over 7,000 FPM descent - the aircraft disappears - and is regenerated at the gate.FS really does not handle descents greater than 36,000 ft very well - from cruise altitude to airport elevation.