GX across borders Some Global Express and Challengers 6XX were sold for military applications and/or Special Missions. Basically, Bombardier sells the plane but needs to make special structural Mods (done in Bombardier Wichita) to accept special/secret electronic, listening devices, ground radar, ground support equipment pods, etc. from the buyer which is often another OEM selling the complete product as a surveillance aircraft or else. They don't really receive a normal Completions sheme. This is often the case for Global Express because it can go to 51000 feet and stay up a long time.
See those links:
-https://www.journaldemontreal.com/2019/06/25/le-global-express-sen-va-t-en-guerre
-https://www.bombardier.com/en/media/newsList/details.ba_20190918_fleet-of-four-modified-bombardier-global-business-je.bombardiercom.html?