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Lockheed Martin X-59 QueSST

Lockheed Martin · Low-Boom Supersonic Technology Demonstrator · USA · Digital Age (2010–present)

Lockheed Martin X-59 QueSST — Low-Boom Supersonic Technology Demonstrator
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The Lockheed Martin X-59 QueSST (Quiet Supersonic Technology) is NASA's experimental aircraft designed to test the feasibility of low-boom supersonic flight — the theoretical ability to fly faster than the speed of sound without producing the loud sonic boom that currently triggers regulatory restrictions on overland supersonic flight in most countries. Developed under NASA's Low-Boom Flight Demonstrator programme by Lockheed Martin's Skunk Works, the X-59 first flew on 21 January 2025 from Palmdale, California, after a development period that began in 2018.

The X-59's distinctive 99-foot-long needle-nose airframe is shaped to reduce sonic-boom intensity to about 75 PLdB (Perceived Level decibel) at ground level — comparable to a car door slamming next door, dramatically quieter than Concorde's 105–110 PLdB "double thunder." A long, thin fuselage with carefully shaped contour, an extended forward boom, an external vision system replacing a conventional cockpit windscreen (the pilot has no forward windscreen — the view is via a 4K monitor), and a single General Electric F414-GE-100 engine all contribute to the low-boom acoustic signature.

NASA's planned 2025–2027 flight test programme has two phases. Phase 1, currently underway, is technical validation: confirming the predicted acoustic signature in flight using ground microphone arrays at Edwards AFB. Phase 2, planned for 2026, will conduct overflights of selected American communities (yet to be named) to measure public response to the aircraft's quieter sonic profile, generating the data the FAA needs to consider relaxing the 1973 ban on civilian supersonic overland flight.

The X-59 is a single-aircraft research platform with no production successor planned. Its data, however, is the regulatory foundation for any future commercial supersonic aircraft (notably Boom Overture and other proposed designs) seeking permission to fly supersonic over land.

For Kids — a shorter, friendlier version

The X-59 QueSST is a special research plane built by Lockheed Martin for NASA. Its full name stands for Quiet Supersonic Technology. It made its very first flight on January 21, 2025, from Palmdale, California.

This plane is designed to fly faster than the speed of sound without making a huge boom. Normally, supersonic planes create a very loud noise called a sonic boom. The X-59 is shaped to make that boom much, much quieter.

The X-59 has a super long, pointy nose. It is longer than a school bus from nose to tail! Its shape is carefully designed so the sound waves don't crash together and make a big bang on the ground below.

The pilot inside has no front window. Instead, they watch a high-quality screen that shows a live view outside. A single powerful engine pushes the plane through the sky at supersonic speeds.

NASA plans to fly the X-59 over towns and ask people what they heard. This will help scientists learn if supersonic planes can one day fly over land without bothering people on the ground.

Fun Facts

  • The X-59 is longer than a school bus, stretching 99 feet from tip to tail.
  • It flew for the very first time on January 21, 2025, in California.
  • The X-59 is so quiet that its boom sounds like a car door slamming nearby.
  • The old supersonic jet Concorde was much louder — like a double clap of thunder!
  • The pilot uses a 4K screen instead of a front window to see where the plane is going.
  • The X-59 was built by Lockheed Martin's special secret design team called Skunk Works.
  • NASA will fly the X-59 over real towns and ask people if they heard anything unusual.
  • The X-59 uses a single General Electric engine to reach supersonic speeds.

Kids’ Questions

What is a sonic boom?

A sonic boom is a very loud bang you hear when a plane flies faster than sound. It happens because sound waves pile up and crash together. The X-59 is shaped so those waves stay spread out and quiet.

Why doesn't the X-59 pilot have a front window?

The plane's nose is so long and pointy that a normal windscreen would not fit. Instead, the pilot watches a sharp 4K screen that shows the view outside. It works like a giant video screen in the cockpit.

Why is the X-59 important?

Right now, supersonic planes are not allowed to fly over most countries because they are too loud. The X-59 tests whether a quieter supersonic plane is possible. If it works, future passengers could travel much faster than today.

Variants

X-59 QueSST
Single research aircraft. 99-ft fuselage, F414-GE-100 engine, Mach 1.4 design cruise speed.

Notable Operators

NASA Armstrong Flight Research Center
Operator of the single X-59 from Palmdale, California / Edwards AFB. Flight test programme 2025–2027.

Frequently Asked Questions

What is the X-59 QueSST?

The X-59 QueSST is NASA's experimental aircraft designed to demonstrate low-boom supersonic flight — flying faster than sound while producing only a quiet thump rather than the loud double-clap of a traditional sonic boom. The data it gathers will inform potential FAA regulatory changes to allow overland supersonic civil aviation for the first time since 1973.

Can the X-59 fly supersonic without a sonic boom?

The X-59 will produce a sonic boom but at a much-reduced loudness — around 75 PLdB at ground level vs. Concorde's 105–110 PLdB. The acoustic signature is described as a "sonic thump" rather than a boom — comparable in loudness to a car door slamming next door.

When did the X-59 first fly?

The X-59 made its first flight on 21 January 2025 from US Air Force Plant 42 in Palmdale, California, where it had been built by Lockheed Martin's Skunk Works. Flight test continues at Edwards AFB through 2027.

Will the X-59 lead to commercial supersonic airliners?

Indirectly. The X-59 is a research aircraft, not a production prototype. Its data is intended to support FAA regulatory changes that would replace the current speed-based ban on civil overland supersonic flight with a noise-based standard. Future commercial supersonic aircraft like Boom Overture would benefit from those regulations.

Why does the X-59 have no front windscreen?

The X-59's long, thin nose contour for low-boom acoustics leaves no room for a conventional cockpit windscreen with usable forward visibility. Lockheed installed an "eXternal Vision System" — a high-resolution 4K monitor in the cockpit fed by forward-facing cameras — that gives the pilot a forward view without compromising the airframe's acoustic shape.

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