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A U.S. Air Force F-35 Lightning II from Hill Air Force Base, Utah, flys alongside a 100th Air Refueling Wing KC-135 Stratotanker during a flight to Estonia on April 25, 2017. The F-35’s are participating in their first-ever flying training deployment to Europe. (U.S. Air Force photo by Senior Airman Christine Groening)

Artist illustration of the X-59 in flight over land.

X-59X59QuesstQuiet SuperSonic TechnologyLow Boom Flight DemonstrationLow-Boom Flight DemonstratorX-59 artist illustrationX-59 artist conceptLBFDsupersonicsupersonicsaeronautics