The SR-71 Blackbird, the ONLY jet in the world (and the fastest) to use RamJet Engines.
Officially, it went MACH 3. Unofficially, it went MACH 5.
It made it from New York to London in less than 2 hours.
If I remember right, it was blueprint (on the table) around 1956-1957.
Prototype (A-12, smaller version of the RS-71, which because of a typo, became the SR-71) around 1960, and I think production started around 1962-1964.
NO manned jet anywhere in the world has been able to get close to its power (powered by the 2 ramjets).
At full speed, the cones at the front of the engine are fully extended, meaning very little air getting into the engine, but at that speed, the compression is so great, that the SR-71 is only using 30% of its fuel (Liquid Oxygen Gel).
That’s what I remember, anyway.
I saw it on the deck of the Intrepid in NY. As I recall it leaked 1/3 of its fuel before the heat from its speed expanded enough to seal its joints.
An amazing craft.
The Concorde did US to London in under three hours. My buddy flew on one of the last flights. He said he was basically in space and could see the curvature of the Earth. Said it was super uncomfortable and devoid of any amenities. He was a first class guy and wasn’t a fan. Kept asking for champaign and caviar...lol.