The SR-71 Blackbird remains ... the J58 could come unglued, or even start to lose turbine blades above 427C. The Air Force, naturally, wanted to keep their engine warranties intact.

Though the first flight for the SR-71 Blackbird would occur in 1964, development for the turbojet engine powering the craft ...

In 1987, Swedish Viggens also aided an SR-71 that had suffered engine failure, escorting it to safety in West Germany, demonstrating the close cooperation between the Swedish Air Force and the U.S ...