Failed to load mods: kj_jug38/airplane.lua:324: attempt to perform arithmetic on field'?' (a nil value)
stack traceback:
__kj_jug38__/airplane.lua:324: in main chunk
(C): in function 'require'
__kj_jug38__/data-final-fixes.lua:49: in main chunk

Mods to be disabled:
*kj_jug38(1.2.0)

Hmm, I also tried the Northrop B-2 Spirit and have a similar error. Maybe some other mod is the cause, I have several loaded.

If I disable the "Light Overhaul" mod, the error does not occur. Both mods seem to touch the light cone, I hope you can resolve this issue.

Edit: Aircraft and Lex's Aircraft work without error with Light Overhaul.

If I install Picker Vehicles, the Light Overhaul mod with your planes work properly.

Found the problem. It's an incompatibility between my planes and their light updates. I will fix this tomorrow. I'll create a new master control mod where i can easily manage my planes. That will make a lot of stuff more easy for me. Sorry for the inconvenience.

As a temporary fix you could deactivate the light overhaul mod, or install picker vehicles an activate the light mod setting.

Thank you for your efforts, very nice work.

I also tested the HO-229 (1.2.0) and it behaves differently with this combination of mods.
The HO-229 does not have an error with the Light Overhaul mod installed, but the plane does not have headlights, just a soft glow around the plane.
If I install Picker Vehicles, the HO-229 will then have headlights.

Just reporting the similar, but different behavior.

Took longer than expected but I also fixed a lot of other things and made the process more streamlined for me.

Error shouldn't occur anymore.