The U.S. airspace is getting busier—and not just with more airplanes. In addition to some 70,000 aircraft traversing the National Airspace System (NAS) each day, commercial enterprises are rapidly introducing a widening variety of new space vehicles and launchers into it. And more are on the way, ranging from rockets carrying supplies to the International Space Station to vehicles for space tourism. In 2015, 22 of the world’s 86 orbital launches were commercial. And today, ...


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