Airfoils per wings increased from 2 to 3 (tip, mid, root) Max number of engines increased from 8 to 16 (e.g. (Apparently) modeling of density altitude with temperature deviations from ISA Improved wake turbulence modeling, influenced by g-load of the aircraft producing it Improved thermal model, with thermals surrounded by a disk of descending air and rising up to cloud tops thermals are also present in real weather, depending on weather conditions and time of day The interpolation is also made in time with weather updates, so no more sudden weather shifts, but smooth transitions Real weather is using worldwide NOAA GRIB data to depict detailed weather at large scales, and it interpolates METAR data from each airport to seamlessly integrate it with the large scale weather The weather conditions also have an influence on the ground (puddles, braking action, etc.) There are 3D clouds of various types (cirrus, stratus, cumulus, cumulonimbus) which change in space and time (so the weather pattern is dynamic). The 'artifical damping' sliders are gone, because the flight model is now so good that they aren't needed anymore Everything in XP12 has been overhauled and rewritten to be physics-based (flight model, weather, lighting, etc.), so that everything appears more realistic and each part is consistent with any other part
