WASHINGTON, April 20 : Federal aviation regulators on Monday ordered billionaire Jeff Bezos' space company, Blue Origin, to investigate the upper-stage malfunction of its New Glenn rocket during a failed weekend satellite launch from Florida. Sunday's mishap, coming on the third flight of the towering orbital launch vehicle and its second for a paying customer, posed a setback in Blue Origin's quest to compete on a more equal footing with Elon Musk's SpaceX, the world's leading rocket-launch