The AI pilot flew the XQ-58A Valkyrie, "a low cost, high performance unmanned air vehicle… built at a cost that permits it to be a combat loss." The idea is that the Valkyrie would be sent to fly dangerous missions, sparing actual pilots and expensive fighter craft.
"This long range aircraft is designed for high speeds and agile maneuverability, enabling it to perform a variety of missions. It is runway-independent, offering maximum operational flexibility to the warfighter."
As for the "runway-independent" bit, the Valkyrie is launched from a mobile rocket platform, and later recovered by parachute.
Here's the Air Force explaining the benefits of having AI fighter pilots:
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Well, it was nice knowing you all.
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