Adding a recon element to the game. Interesting.
Nobody should confuse this idea with making the map completely blacked out so you don't even know the lay of the land. No.
It should be greyed out. You can see the terrain on the map, but you have no idea what is on that land. Where are the army units (I beleave that AI army units on the ground will play a part of all of this)?
Recon planes can find the army units, then the strike aircraft can attack them, and the fighter units can protect both the recon and strike planes and/or attack the enemy strike and recon planes.