The Citation Mustang by Ron Wilson of RWDesign is a great simulation of a small business jet. The Mustang was originally developed for X-Plane 11 (June 2019), and as time and technology march forward, some of the features and operability of the Mustang were left behind.
This update for X-Plane 12 includes a replacement of the manipulator system (better VR interaction), a VR-friendly Options popup window allowing for placement of passengers and opening/closing of doors, a registration plate on the panel to remind us online pilots what aircraft registration number we’re flying today, replaced the UV mapping of the exterior windows to allow for XP12’s rain and ice weather effects, updated interior and exterior lights for XP12, and a revised flight model to bring back a “closer” performance model. (I’m sure the flight model could still be improved.)
This modification requires the original release for XP11 available at the .org store, as the new update refers to all the original modelling, texturing, etc.