Drones.

Pilot less Aircraft.

The drone was chiefly developed by Israel for reconnaissance missions in hostile territory, such as South-Lebanon. IAI developed a series of drones, the Ranger and Scout which could be launched from a mobile unit using a small air strip. 

Israel also worked on the now abandoned helicopter drone Helistar. but it is the U.S. who have gone one step further and have invented a plethora of types. The Predator is probably the most well known of them, some of this is shared with the cruise missile computerization.

Drones are far cheaper and safer than risking the lives of aircrew in a hostile environment. Civilian casualties will always remain a factor in war of any kind.