Air Base 91 (Baza Aeriană 91) had been the home of the 91st Fighter Group (Grupul 91 Aviatie Vanatoare) before 2002, when flying operations ended at Deveselu airfield. At that time it was the only Romanian Air Base flying non-LanceR MiG-21’s. 29 classic MiG-21’s, comprising a range of variants (MiG-21F-13, MiG-21M, MiG-21PF, MiG-21PFM, MiG-21U-400, MiG-21U-600, MiG-21US) and a sole IAR-93 remain grounded from the time of the base closure.
The air base was originally built by the Soviet Union, the first MiG-15’s arriving in March 1952, they were eventually replaced by MiG-19’s. The first squadron of MiG-21F-13’s arrived in February 1962. On June 30, 1982, the 91st Fighter Regiment operated from Deveselu with the 48th Fighter Squadron. The 91st Fighter Regiment comprised of two squadrons (91/1 Squadron with MiG-21 MF/UM and 91/2 Squadron with MiG-21 PFM/US. On June 30, 1986, the 48th Fighter Squadron became the 71st Fighter Regiment and on June 9, 1987 was transferred to Câmpia Turzii.