Where did contrail really come from?

Did I miss the explanation, am I the only one curious about the mystery missile launch off of the west coast? It sure was covered up fast, one little blurb “Oh it was just a jet contrail.” No real explanation from our government.

I have seen several ex-military (pilots, submariners) state that in no way was that a contrail from a plane. Where did it come down? Test for an EMP?

DAVE HANCOCK

Sandpoint