Correct, however given that any addition to the plane has the potential to cause unintended conflicts with critical systems (i.e. in the downed Swissair flight 111 example I gave in another comment) I was suggesting that these should still be treated just as seriously.

Don't get me wrong though, I don't think that using JS in a plane is a bad idea. In fact I think the aviation industry is extremely slow moving and it frustrates me, fortunately the experimental category has access to some interesting tools but for certified aircraft you're very restricted in what you can and cannot do to modify the aircraft.