<ul><li>Boom Supersonic's XB-1 prototype becomes first civil aircraft to break sound barrier over US.</li><li>During its 13th test flight, XB-1 successfully passes the 'Mach cutoff' and demonstrates no disruptive sonic boom.</li><li>The test flight included measuring acoustic sonic boom data and capturing Schlieren images.</li><li>Boom Supersonic concludes its multiyear flight test program and focuses on scaling technology for the Overture supersonic airliner.</li></ul>

Experimental jet achieves supersonic flight, minus the boom

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