Airborne early warning aircraft systemsmost often referred to as "AWACS" are among the most significant elements of modern air forces; by placing powerful radar units atop airborne aircraft, air forces are able to vector friendly fighters directly to enemy aircraft, allowing smaller fighter forces to more effectively patrol larger areas. This authoritative book details the history of AWACS around the world, from the first combination of aircraft and radar in the 1930s to todays highly sophisticated technologies and hardware. Complete histories of previously classified programs, technological evolutions, obstacles, and combat operations are provided. A photo section illustrates major aircraft types.