[dingaling]

The engines of the MiG-25 had a service life of a few hundred hours and no parts have been made in many years. That was one reason that the Indian Air Force had to retire theirs without a replacement.

In contrast J79 engines and parts are available on ebay and knowledge of how to maintain them us fairly common, just check Youtube!

[justin66]

F-104 airframe spares are readily available as well. I don't know if Starfighters has just been in the press lately or what, but I read recently that they acquired a few new planes.