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Probably the SR71 at the highest. Anything from Airbus as the lowest. Shit is insanely easy once you know how to program your stuff. Get any respected simulator model e.g. Flightfactor 320 for xplane 11 and you can teach yourself.
Im in the flight decks of 320's every day during some procedures as a dispatch and I can tell you it's exactly the fucking same as a sim.