As of 2026, there are no commercial or standard operational military planes that fly at 2,500 mph (which is roughly Mach 3.2), but the legendary Lockheed SR-71 Blackbird holds the record for the fastest air-breathing manned aircraft, having officially reached speeds of 2,193 mph (Mach 3.3). However, in the realm of experimental and upcoming aviation, the North American X-15 was a rocket-powered plane that reached a staggering 4,520 mph (Mach 6.7) in the 1960s. For a more "modern" answer, the Hermeus Quarterhorse is an uncrewed hypersonic jet currently in testing in 2026 that is designed to eventually reach speeds of Mach 5 (over 3,800 mph) using its proprietary Chimera turbine-based combined cycle engine. Additionally, the highly secretive SR-72 "Son of Blackbird" being developed by Lockheed Martin is rumored to be designed for speeds in the Mach 6 range. In the commercial sector, companies like Boom Supersonic are working on the Overture jet, though it is designed for a more modest 1,300 mph (Mach 1.7) to ensure environmental and noise compliance, leaving the 2,500 mph mark strictly in the territory of high-tech defense and experimental aerospace projects.