ATC constantly looping climb/descent instruction to AI

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Pressure Altitude

There are two issues at play here. First, VatSpy, the VATSIM website, and other 3rd party apps are reading the altitude from the “plane altitude” simulation variable, which is the airplane’s true altitude, not the pressure altitude. This has always been an issue when above the transition altitude. Unless the sea level pressure is 29.92, the true altitude will be different than the pressure altitude. The second issue is that MSFS is the first and only sim that takes into account the pressure la…