Lack of maintenance parts is just a kill switch with a timer.
Jet Fighters need a lot of maintenance, they are not like cars.
So a kill switch in software is not needed. If the US stops shipping parts, then it is only a matter of time before the Jet Fighters is an expensive paper weight.
Exactly. There probably is a kill switch (the temptation to add one is just impossible to resist), but it's not even needed. Stop maintenance, and in a matter of days these things can't fly.
F35 is networked heavily, for its sensor fusion and various abilities. It has probably 25 million LOC and is heavily software dependent. It should be viewed somewhat as a closed software product that needs heavy vendor support right from mission planning.
Jet Fighters need a lot of maintenance, they are not like cars.
So a kill switch in software is not needed. If the US stops shipping parts, then it is only a matter of time before the Jet Fighters is an expensive paper weight.