The Lockheed Martin SR-72 is a conceptualized hypersonic UAV intended for intelligence, surveillance and reconnaissance proposed by American company Lockheed Martin to succeed the retired Lockheed SR-71 Blackbird.
The SR-72 - The Successor to the SR-71 Blackbird
China Panic: SR-72 hypersonic Mach 6 scramjet spy plane - can cross the Atlantic (China or Russia)
Lockheed Martin's mysterious SR-72 — the fastest plane ever
Lockheed Martin SR-72 Hypersonic Aircraft CONFIRMED?