The Lockheed Martin SR-72 'Son of Blackbird': It Could Hit Mach 6 and 80,000 Feet But No One Really Knows If It Exists

Lockheed Martin’s SR-72 “Son of Blackbird” has been talked about for years but never confirmed by the U.S., even as the program’s public footprint changed repeatedly. The aircraft was revealed publicly in November 2013 by Skunk Works, with a target operational date around 2030 and a demonstrator plan described as costing under $1 billion. Since then, reporting and remarks have fueled speculation, including alleged sightings over California’s desert and later language from executives that appeared to reference the aircraft in the past tense. In March 2018, mentions of the SR-72 disappeared from Lockheed’s website. A later reference in Lockheed filings lists a classified charge of $950 million. As of August 2026, no official confirmation exists.