NASA X‑59 reaches Mach 1.53, its highest speed to date
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NASA's X‑59 reached Mach 1.53 (about 1,625 km/h), the highest speed it has achieved since flight tests began in October 2025. It flew twice on 22 September, twice on 24 September and twice on 25 September, totaling six flights in a week, a program record. The aircraft has completed 38 flights since its first flight in October 2025.
After the September campaign the X‑59 entered about three weeks of scheduled maintenance, during which NASA intends to inspect the aircraft and its systems before resuming flight testing.