Nimrod AEW

Listed here are a number of interesting reconnaissance and AEW aircraft, space vehicles and UAVs that, for a variety of reasons, never made it into operational service. In addition, I've included some other aircraft which had a planned reconnaissance capability, which was never installed.

DarkStar Antonov AN-72 AEW
BAe/HS 748 AEW
BAe Nimrod AEW 3
Boeing Condor
Boeing X-20 DynaSoar
Convair Kingfish
EE/BAC Lightning F.53
Euromale UAV
Hughes XF-11
Lockheed Martin - Boeing RQ-3A DarkStar
Northrop YRB-49A
Republic XR-12 Rainbow
Teledyne AQM-91A Compass Arrow