Why didn’t it succeed?
Concorde flights came to a screeching halt after only 27 years of operation on October 24, 2003. The reason? Excessive cost, high fares, and loud noise. On a regular flight, Concordes consumed 6,771 gallons of fuel, which quickly exceeded the profit made from the flight. In addition to that, only a total of 20 Concordes were built and no airline ordered them except for Air France and British Airways, who had to as they were state-run airlines at the time.
Oh, and a 2000 crash that killed everyone on board (109 people) and four people on the ground.
IIRC the only fighters that can supercruise (go supersonic without gushing fuel out of afterburners) are super modern jets like the F22, and still not at Mach 2.
Some older specialized craft could go Mach 2 efficiently, like blackbird or the XB-70, but they’re all long retired.
Concorde was realistically the only plane that could do that.
The SR-71 Blackbird is the closest thing I’ve seen to evidence that we had alien technology in the 60s. That thing is fucking wild. It doesn’t even look real in photos, it looks like mediocre cg