NASA is preparing its X-59 aircraft for its inaugural supersonic flight in early June, aiming to achieve speeds over 630 mph. The agency plans further tests to reach Mach 1.6, or 1,218 mph, at higher altitudes. Meanwhile, the FAA has grounded SpaceX's Starship program following a mishap during its latest test flight, where the Super Heavy booster failed to perform a proper boostback burn and experienced a hard splashdown. AI
RANK_REASON The cluster covers a significant upcoming flight test for NASA's X-59 supersonic aircraft and a regulatory grounding of SpaceX's Starship program. [lever_c_demoted from significant: ic=1 ai=0.1]
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