The T-28 series of aircraft was designed by North American Aviation as a replacement for that Company’s very successful T-6 series as a standard basic trainer for the US military services, but in the event it was not particularly successful in that role and was developed into a counter insurgency

The Explorer has been produced by Tomair for the Australasian market and the aircraft is basically a high-wing variant of the Cobra.

Evektor-Aerotechnic AS of Kunovice in the Czech Republic was formed in 1991 and a lot of its work over the years has been involved in the production of parts for aircraft designed by Aero Vodochy, particularly parts for military trainers.