didyouknow

Engineering

Yeah I've come to the conclusion that my answer is undoubtedly SR-71

Why:
- Operated at 85,000 ft, at over Mach 3 (~2100 mph)
- No SR-71 was ever shot down, because Mach 3
- 1 hour flight from SF to NYC
- A special titanium body out of it from scratch for it
- Absolutely bonkers

https://warpcast.com/jayme/0xba21812e

The outer skin of the SR-71 doubled as the wall of the fuel tank. They built in small gaps between panels to allow the skin to expand at top speed/high altitude. As a consequence, it leaked a little when on the ground.