NASA’s X-59 jet is preparing for its most critical test yet: breaking the sound barrier for the first time. Engineers have completed a series of flights that pushed the aircraft to near-supersonic speeds, setting the stage for a milestone attempt.

The sleek, needle-nosed aircraft is designed to replace the disruptive sonic boom with a much quieter "thump." Success could unlock supersonic passenger travel over populated areas, a market long stifled by noise regulations.

After reaching near-supersonic speeds in previous trials, the X-59 will aim to fly faster than Mach 1, eventually targeting Mach 1.6 at an altitude of 60,000 feet. No specific date for the supersonic flight has been announced.

If the quiet supersonic technology proves viable, it could reshape commercial aviation by drastically cutting travel times over land. Regulators would need to update noise standards, a process the agency is already exploring with community response data.

Critics argue that even a reduced noise signature may still face public opposition, and the path from a single experimental flight to certified commercial aircraft remains long and uncertain.