NASA's experimental X-59 aircraft is preparing for a critical series of test flights in June, aiming to achieve supersonic speeds without generating a loud sonic boom. Following months of tests and envelope expansion maneuvers, the X-59, built by Lockheed Martin and first flown on October 28, 2025, is scheduled to exceed the speed of sound for the first time. Initial supersonic flights will occur at speeds over 630 mph at 43,000 feet, followed by a mission conditions flight reaching Mach 1.4 (925 mph) at 55,000 feet. These altitudes and speeds are crucial for NASA's goal of demonstrating quiet supersonic flight over U.S. communities and gathering public feedback on the aircraft's intended "sonic thump" instead of a boom. The X-59's unique design, featuring a long, needle-like nose and top-mounted engine, is engineered to minimize noise, potentially paving the way for commercial supersonic air travel.