Oshkosh Corporation Challenger CL-604 for the JBAI model.
These are textures only.
The JBAI Challenger 604 model is required.
It can be found at https://library.avsim.net/esearch.php?CatID=fs2004aia&DLID=121019
The converted P3Dv4 model can be found here:
Flightplans available here: https://aibizjetproject.wordpress.com/tag/oshkosh-corporation/
EDIT 24 MAY 2020: paint updated based on latest paintkit