High-Speed Military Prototypes and Reconnaissance Aircraft

was an experimental variant of the North American Mustang I

The Avro 720 was an in-development British single-seat interceptor of the 1950s.

The Grumman XF10F Jaguar was a prototype swing-wing fighter aircraft offered to the United States Navy in the early 1950s.

The Lockheed A-12 is a retired high-altitude, Mach 3+ reconnaissance aircraft built for the United States Central Intelligence Agency (CIA) by Lockheed's Skunk Works

The Grumman F11F-1F Super Tiger (company designation G-98J) is a single-seat fighter aircraft originally developed for the United States Navy (USN).

Lockheed's proof-of-concept demonstrator for a stealth fighter

is an American supersonic reconnaissance drone

is a Russian twin-engine, forward-swept wing, supersonic technology demonstrator developed by the JSC Sukhoi Company.

The Lockheed SR-71 "Blackbird" is a retired long-range, high-altitude, Mach 3+ strategic reconnaissance aircraft that was developed and manufactured by the American aerospace company Lockheed Corporation.

The Lockheed YF-12 is an American Mach 3+ capable, high-altitude interceptor prototype, developed and manufactured by American aerospace company Lockheed Corporation.

The North American Aviation XB-70 Valkyrie is a retired prototype version of the planned B-70 nuclear-armed, deep-penetration supersonic strategic bomber for the United States Air Force Strategic Air Command.

The Sukhoi T-4, also known as "Aircraft 100", "Project 100", or "Sotka" is a Soviet high-speed reconnaissance, anti-ship and strategic bomber aircraft that did not proceed beyond the prototype stage.

The Myasishchev M-50 (Russian: Мясищев М-50; NATO reporting name: Bounder) is a Soviet prototype four-jet engine supersonic strategic bomber which never attained service.

The Northrop-McDonnell Douglas YF-23 is an American single-seat, twin-engine, stealth fighter prototype technology demonstrator designed for the United States Air Force (USAF).

program to develop a spaceplane