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Skinnereal wrote: At Mach 6, or 4,500 MPH, they can be anywhere in under 3 hours.
Not necessarily. It might have a top speed of 4500 MPH, but how much fuel can it carry? If you've only got 15 minutes at mach 6 you've got a lot of speed to get through AA defenses and hit a target, but not even close to enough to go anywhere in the world.
Small nitpick: 2040 m/s (4500 MPH) is about Mach 6 at sea level and that's where this plane will never reach Mach 6 as the air is too dense (and turbulent?) there. At 12 km height it's "only" 1770 m/s (3960 MPH).
