Bowser has several good points
Planes are used against planes (cold war) or to dominate the sky.
But it doesn't seem to work wit guerilla wars and terrorism.
Even though the US has achieved air domination in Iraq almost from the start of the war, there is still no peace there.
Money could be much better spent in training for Human intelligence.
The problem is this (and very simple): the people from an invaded country will ibe smarter than the invador (because they are more motivated) and manage to take the invador to the kind of war they want. I'll always remember Vietnam veterans warning against a guerilla war in Iraq. That's exactly what happened.