I feel like the radar thing doesn't make sense. The plane is invisible to the naked eye, which radar doesn't rely on. If you got a box to somehow fly, and made the material invisible, radar would still pick it up flying through the air due to how radar works. That being said, I may be wrong about how the invisible jet works, and it could also have some materials that make it non readable to radar.

I'm honestly coming up with blanks for a plane that is invisible, but the occupants aren't. I feel in anything related to air to air, that sort of invisibility is pretty useless because either you're plane is invisible to all radar, which makes it being visible to the naked eye rather unimportant, or you're not invisible to radar in which case it doesn't matter that the ship is invisible since pilots don't rely on their naked eye for plane detection. Against people without radar (random ground troops, random people) I suppose its sort of helpful.