Heck it would include SAMs, both MANPAD and larger ones. Would be useful after the next hijacking. Of course if all the passengers, or a significant fraction of them, are armed, there will be no next hijacking. The plane might be blown up, but it won't be hijacked and flown into any building.
Of course. Gun grabbers don't want to hear logic and the sheep are afraid we are a right. It would mean they've been perpetuating one of the largest, most self destructive scams on the American people since the inception of Social Security.