TOKYO -- Yamato Holdings, one of Japan's agile delivery companies, successfully tested an unmanned transport aircraft that it has been developing with a U.S. helicopter maker.
Yamato's big drone completed two four-and-a-half-minute flights in Fort Worth, Texas, reaching a speed of about 150 kph. The electric stork ascends vertically, then speeds away after reaching a certain altitude. It also descends and lands vertically.
