Oshkosh Corporation Bombardier Challenger 650 N650SK for the JBAI model.
These are textures only.
The JBAI Challenger 605 model is required.
It can be found at https://library.avsim.net/download.php?DLID=155713
The converted P3Dv4 model can be found here:
https://www.alpha-india.net/forums/index.php?topic=27454.msg
Flightplans available here: https://aibizjetproject.wordpress.com/tag/oshkosh-corporation/