Enlarge / United Launch Alliance's Atlas 5 rocket, seen here in its "501" configuration without any solid rocket boosters. (credit: United Launch Alliance) Amazon has confirmed it now plans to launch the first two test satellites for the company's Kuiper broadband network on a United Launch Alliance Atlas V rocket as soon as next month, shifting the payloads off of the inaugural flight of ULA's new Vulcan rocket. The shift has been rumored for several weeks after ULA delayed the first flight of its Vulcan rocket from the summer until the fourth quarter of the year.