Make a drone that casts away unnecessary parts and turns into a missile when it's close to the enemy. It can carry half the fuel (or fly twice as long), doesn'

Make a drone that casts away unnecessary parts and turns into a missile when it's close to the enemy. It can carry half the fuel (or fly twice as long), doesn't need landing mechanisms, can be made with less focus on durability (just needs to survive one flight). It can be very small and fly low (and subsonic) to avoid detection. It could even land and wait near military airports on top of trees etc. Basically it would work like movable minefields in air. Denying territory to the enemy planes.