The Avro 730 was a planned Mach 3 reconnaissance aircraft and strategic bomber that was being developed by Avro Aircraft for the Royal Air Force. It had been originally envisioned as a very high-speed

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.