There were reports that 0bama threatened to shoot down Israeli aircraft when they were considering a strike last year. Also, on of the purported "secret agreements" that Hussein and sKerry agreed to, was to guarantee that Israel wouldn't strike Iranian nuke facilities.
I read that too. But I have trouble believing that a US officer would actually follow such an order. Target an Israeli plane, then pull the trigger. I just can't process that.
Remember the scene from the Sand Pebbles where the US ship's captain ordered his crew to fire on the Chinese civilians? Everyone's guns "jammed". I would hope that the same would happen here.
But I suppose I'm being way too optimistic.