"Tamas Feher" wrote:
Why would a cheap subsonic jet trainer need an expensive
low-volatility fuel (JP7) typically associated with the SR-71?

Typically? Airliners used to use the JP7 up until it was banned for
being hazardous.

Airliners don't use JP7.

Rumor says some african countries still sell it at
their airports.

I doubt that any african country even has the required facilities to even
produce JP7.