You make sure your opponent never gets flight Really, I would use SAM considering the disadvantages of Democracy. But in the other gov'ts I would use a fighter because it can spot other land units and it can fly out a bit and scout.
Save the whales, collect the whole set!!
If Al Gore invented the Internet, then I invented the spell check- Dan Quayle
If someone doesn't agree with you, you haven't explained yourself well enough-Luther Ely Smith