The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Date has passed, but interestingengineering.com does not confirm it happened then; unverified.
Wikipedia's X-59 article gives the 99.7 ft length, 29.5 ft wingspan, single General Electric F414 engine, Mach 1.42 cruise at 55,000 ft and the 75 EPNdB thump projection.
NASA's[4] Quesst blog says the X-59 flew "Mach 1.4 (about 924 mph) and an altitude of 55,000 feet" on 12 June 2026, days after its first supersonic flight at Mach 1.1.
NASA's[3] own account confirms the X-59 quiet supersonic research aircraft (the jet the pin describes NASA 'getting closer to building') took its historic first flight on 28 October 2025, the concrete realization of the program the pin's 2018-era article speculated about.
Aviation International News independently corroborates the 28 October 2025 first flight of the X-59 from Lockheed Martin's Skunk Works.[1]
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