A jet engine is any engine that can propel ... their functionality requires a high speed to even begin operation. In testing, aircraft with scramjet engines must be lifted to altitude by another ...

The aircraft is a scramjet-powered hypersonic aircraft ... Viewers likely walked out of the theater wondering if such a jet existed, as there is a well-known predecessor, the famed SR-71 Blackbird.

The first scramjet, an airbreathing jet engine capable of pushing an aircraft beyond Mach 5, was successfully flown in the early 1990s. But while pretty much any other technology you could imagine ...