An article in a Washington paper this AM has the US big 3 already on Trumps ear.
I doubt Trump would have set foot on any of the US Big 3 in decades. If he has had the misfortune then more likely he'll want to euthanize rather than protect them.
I'm sure any New York attorney worth his salt could easily make a case that forcing American consumers to fly long haul on their own airlines would be tantamount to a crime against humanity.