Lockheed EC-121D Constellation
EC-121, originally designated as the RC-121, is a radar-picket modification
of a USAF C-121 passenger airplane which evolved from the Lockheed
"Constellation" commercial transport. The massive radomes above and
below the fuselage carry six tons of electronic gear. These aircraft
entered service with the Air Defense Command in 1953, flying patrols off the
U.S. coasts as an aerial extension of the Distant Early Warning (DEW) Line.
The Air Force ordered 82 EC-121s between 1951 and 1955, 72 of which were
Click on the thumbnails below to view larger images.