The Northrop YA-9 is a prototype attack aircraft developed for the United States Air Force A-X program. The YA-9 was passed over in preference for the Fairchild Republic YA-10 that entered production as the A-10 Thunderbolt II.

a9攻击机 空军把性能需求发给12个航空器制造商。 其中有6个公司做出了答复并做出了设计方案，最后只有2家公司被选中建造原型机进行竞争。

2023年7月11日 · In the mid-1960s, the U.S. Air Force presented aircraft manufacturers with an interesting challenge—design a clean-sheet close air support (CAS) aircraft to replace the aging Douglas A-1 Skyraider.

The Northrop YA-9 was a prototype attack aircraft developed for the United States Air Force A-X program. The YA-9 was passed over in preference for the Fairchild Republic YA-10 that entered production as the A-10 Thunderbolt II.

The Northrop A-9A was a large ground-attack aircraft which was designed in competition with the A-10 in the early 1970's for the A-X requirement.

Under the designation Northrop YA-9A, the company built two prototypes of a single-seat close-support aircraft as the company's submission for the competitive development phase of the USAF's A-X close-support aircraft competition.

The Northrop A-9A was a large ground-attack aircraft which was designed in competition with the A-10. Although it was not chosen for production, it was a formidable aircraft in its own right. Like the A-10, it carried many "hard points" for weaponry beneath its wings. One A-9A is currently in the March Field Museum at March Air Force Base.

The sad reality is that the YA-9 and A-10 were born of a concept best depicted in initial artists impressions as being a jet powered Skyraider toting multiple-MER worth of Mk.82 over a fireball exploding out of the jungle.

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