A SUPERSONIC jet that could fly from London to New York in under four hours is preparing for take-off.

NASA’s X-59 - dubbed "Son of Concorde" - is having final safety checks before making a historic maiden flight.

The futuristic jet is projected to cruise at Mach 1.5, or around 990mph, potentially cutting the transatlantic journey down to just three hours and 44 minutes.

Standard commercial flights typically take seven to eight hours.

On August 18, 2025, NASA X-59 maintenance teams conducted a crucial hydrazine safety check at U.S. Air Force Plant 42, validating the toxic but vital backup system foir in-flight engine restart before the aircraft's first flight.

Hydrazine, a highly corrosive chemical, poses significant health risks including skin burns and respiratory damage.

The safet

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