Constructed as a RC-121D and delivered to the USAF as 53-0554 in October 1955. Redesignated as EC-121D in September 1963. The first EC1-21 to reach 20.000 hours (in 1968). Redesignated as C-121T in Septmber 1970. Transferred to the USAF Reserves at Homestead AFB in October 1974. Retired and ferried to Davis-Monthan AFB for storage in February 1976. Transferred to the Military Aircraft Storage and Disposal Center (MASDC) with inventory number CK0197. Transferred to Pima in 1981. Judging photos, the aircraft underwent restoration between 2012 and 2017. Photographed outside again in October 2019 with a fresh coat of paint.

After 7 long years the Connie finally flew from Camarillo to its new home at Yanks Air Museum

Ex USAF 53-548. Owned by Wayne Jones' Global Aeronautical Foundation, acquired from the Pima Air Museum in 1995. Sold to the Yanks Air Museum in Jan 2006, and restored to flying condition and flown from Camarillo, CA to Chino, CA 14-Jan-2012 on delivery to the museum.

Flew again in 1995 as N548GF from Tucson to Camarillo, California. Joined the airshow circuit until corrosion grounded it in 2000. Ferried to Chino, California, in January 2012.

Delivered to USAF 10.55 as an EC-121D. Later EC-121T. Retired from &( AEW & CS Homestead AFB Florida by 08.74.. Stored at DM and later passed to the Pima Museum.

Owned by the Helena Vocational-Technology Centre as an instructional airframe while retaining its USAF markings. Was registered N4357L in 1981 for its delivery flight to Helena. Cancelled 2013. In 2017 transported by road to Castle AFB, California for display

To Helena vocational technical school. Delivered as N4257L in 1981. In 2023 location is Castle Air Museum in Atwater, California.

79th Airborne Early Warning & Control Squadron, arriving with No.2 engine's propeller feathered.

Instructional airframes at the Helena Vocational Technical Center, with T-39A 61-0677 parked in front. This EC-121T is ex USAF 52-3417 but this serial is no longer carried, despite it still carrying its USAF livery. In May 2009 it was acquired by the Evergreen Aviation Museum, with plans to move it to McMinnville, OR. However, restoration work on the aircraft was halted when Evergreen declared bankruptcy in Dec 2013. The Connie was transferred to the Castle Air Museum in Jan 2014, but the current status of the project is unclear. Note the "Helena VO-Tech" titles on the radome.

retired toto MASDC Sep 25, 1978

This Connie was delivered to the USAF in 1955 as RC-121D 53-548 and converted to EC-121 standard eight years later. Her last base was Homestead and was the last EC-121T to be SOC and flown to MASDC in 1978. After being rescued from the boneyard by the Pima A&SM she was declared surplus to their needs, sold and, after restoration, appeared at air shows until being grounded by corrosion at Camarillo in 2000. Bought in 2005 by Yanks Air Museum she was finally ferried to CNO on 14th Jan. 2012.

Ex USAF 52-3417. Now used for training airframe technicians at the Helena vocational technical school, together with T-39A 61-0677.

Now moved to the restoration compound at the Pima Air & Space Museum, hopefully, she will be back on display soon looking as good as new.