Instructional airframes at the Helena Vocational Technical Center. This T-39A was registered to the Helena Vocational Technical Center as N9166Y on 5 Nov 1993, but it is very likely that this registration was never actually painted on the aircraft. It was cancelled from the register 15 years later, on 9 Dec 2008. The Connie behind is EC-121T N4257L, ex USAF 52-3417.