If N Korea goes too far and is attacked what airborne assets would be used

This is posted soon North Korea seriously raised tensions in east Asia by routing a ballistic missile over northern Japan. It is reported that 3 missiles were launched, one of which malfunctioned and broke up early in its flight. What if it had been the one passing over Hokkaido and had crashed down onto Japanese soil? I believe that would have been an act of war (intentional or not).

If North Korea does finally cross the line or USA/South Korea feel forced into starting hostilities, what air assets would be likely to be deployed against the enemy and how might they be used?