For decades, the SR 71 Blackbird ruled the sky, cruising at Mach 3.2 - about 2200 miles per hour.
It was so fast that thousands of missiles fired at it never scored a single hit.
For half a century, nothing came close.
Now something faster is coming.
The SR 72 Darkstar.
A new stealth aircraft built to push toward Mach ten - nearly 7700 miles per hour.
At that speed, modern air defenses barely have time to react.
So the real questions are:
How close is the SR 72 to the sky?
And will it be airborne in the present war?
