You're air superiority means nothing if you don't know who is the enemy and who is not. How can you tell if that truck is carrying boxes of ammo or boxes of clo

You're air superiority means nothing if you don't know who is the enemy and who is not. How can you tell if that truck is carrying boxes of ammo or boxes of clothes? Also you can't surveil everywhere and you cant track everything. Furthermore airplanes can't hold ground they can clear it but that doesn't stop someone from hiding in a cave and coming back out.