I can't remember this old pc fighter jet game. :(?

The game played from a top-down perspective (e.g. galaga), and you control a fighter jet. You had a variety of weapons that you could switch out between missions, and as far as gameplay goes, the environment would pass by beneath you as you progressed (to simulate speed) and you'd have various land and airborne enemies that are shooting at you as you go. I remember the game being pretty difficult, and at the end of each mission there would be a massive heavily armed boss that you'd have to defeat.