A black triangle with no tail and no second seat, the U.S. Air Force's X-66 answers a Quirk problem with a laser and a sensor suite. It reads an enemy's biology mid-dogfight and works out what they can do before the shooting is over.
X-66 designates a combat aircraft flown by the United States Air Force. It first appears in Chapter 328 and Episode 138, though the name itself is not given until Chapter 334.
The aircraft seats one pilot and is built for combat. Black across the whole airframe, it uses a flying wing layout in a triangular planform: the fuselage runs short, the surfaces curve, and broad flat expanses cover the plane above and below. The silhouette owes a clear debt to the Northrop B-2 Spirit stealth bomber.
Its principal armament is a laser cannon slung beneath the fuselage. Against EPM attacks it can raise Anti-pulse fields as protection. Sensors complete the package: the jet gathers information on every biological response an enemy produces and analyzes their Quirk from it while the fight is still in the air.

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The X-66 is a combat aircraft flown by the United States Air Force. It first appears in Chapter 328 and Episode 138, though its name is not revealed until Chapter 334.
The X-66 is finished entirely in black and uses a flying wing design with a triangular shape, a short fuselage, and broad curved surfaces, a silhouette that clearly recalls the real world Northrop B-2 Spirit stealth bomber.
The X-66's main weapon is a laser cannon mounted beneath the fuselage, and it can raise Anti-pulse fields to defend against EPM attacks.
The X-66 is equipped with sensors that read an enemy's biological responses and analyze their Quirk while combat is still underway.
The U.S. Air Force's X-66 jets open fire on Tomura Shigaraki with their laser cannons.
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