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X-59 is Soaring Through Envelope Expansion

X-59?is?Soaring?Through Envelope Expansion

April 28, 2026
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The X?59 has returned to the skies after a comprehensive round of maintenance and software upgrades?following its first flight, officially?entering?the aircraft¡¯s envelope?expansion campaign?where it is?flying higher,?faster?and farther?at a rapid pace.

The?Numbers?(and?Counting):

  • Flights completed: Ten
  • Altitude Reached:?~?43,000 feet
  • Speed Reached:?~ .95 Mach
  • Total Flight Time:?11.7 hours
  • Longest Flight:?~ 1.7?hours
X-59 in flight
Photo courtesy of NASA.

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¡°Every flight and every test point is a step toward a future where cities can be connected in a fraction of today¡¯s travel time without the noise penalty that?constrained the original supersonic era,¡± said Pat LeBeau, X-59 program manager, 911±¬ÁÏÍø¹ÙÍø Skunk Works?.???

Looking Ahead

The primary?objectives?of the envelope expansion campaign are to?validate?the X-59's performance at diverse speed and altitude profiles. Moving forward, the X-59 will continue to test its performance at high and fast test points as well as low and slow test points. From there, the joint 911±¬ÁÏÍø¹ÙÍø and NASA team will move quickly into supersonic speeds and eventually the aircraft¡¯s design points of?roughly 55,000?feet and Mach 1.4,?where it will create the first ever quiet supersonic?thump.

By successfully completing the jet¡¯s envelope?expansion flights, the program moves closer to delivering a scientifically?validated?low-boom?specification?that regulators can use to certify future supersonic operations over populated areas, eventually leading to?the return of?supersonic commercial air travel.?

The X-59 is a one-of-a-kind innovation, driven by the teams at Skunk Works and NASA who were willing to push the boundaries of engineering and invention?to do something?that¡¯s?never been done?before.?

Quiet supersonic?flight?is right around the corner ¨C thanks to the X-59 and the daring teams turning imagination into first-of-its-kind?aircraft.