Jonathan. I'm a stubborn old fool & don't give up easily. I won't be happy until you fix this so I've been giving it some thought.
First of all it might be best to delete all those jets that don't work & start again. It's quite possible you have 2 of the same aircraft installed which would cause a conflict. Make sure you have that Lear45 folder installed correctly & start again. The Eurofighter won't be ideal due to the way it's configured. Pick any other jet from the CFS2 section & try that.
You haven't mentioned it but if you're getting any kind of error messages it's quite likely you have too many aircraft installed. This would explain your problem. If the number of folders in CFS2\AIRCRAFT is anywhere near 90 try deleting or moving some. The easiest method is to create a Hangar subfolder in CFS2\AIRCRAFT & drag some into it. Don't move or delete any default aircraft. Hope this helps.
PS. If all else fails try "The Hunters" campaign from the link in my signature. This is self-contained & auto-install. The 3 small downloads include the Jet Base file + all the files you need. I configured & tested the files myself & know it works. We have had very few complaints, mainly caused by people not reading the instructions. 100s of satisfied customers can't be wrong.
