The second launch of Amazon’s multibillion-dollar satellite internet project will have to wait a bit longer. United Launch Alliance called off a launch planned Monday from Cape Canaveral Space Force Station in Florida, “due to an engineering observation of an elevated purge temperature within the booster engine” of its Atlas V rocket, according to a statement from the company. It was to have been the second launch in support of Amazon’s $10 billion Kuiper Project, a network of low Earth orbit satellites that will deliver low-latency broadband to global customers. Monday’s launch would have placed 27 Kuiper Project satellites, doubling the total in orbit to 54, out of an initial planned 3,232. SpaceX’s Starlink, in comparison, currently has more than 7,700 satellites in orbit and 6 million worldwide users. ULA has yet to reschedule the launch. Amazon has contracted with ULA to launch 46 Kuiper flights, which will deploy the majority of the former’s satellite broadband constellation. Of those, 38 will use ULA’s new super-heavy Vulcan platform, which will allow larger batches of satellites to be put into orbit. Blue Origin provides BE-4 rocket engines for Vulcan – engines that are made and tested in Huntsville then integrated with the rocket at ULA’s Decatur factory. For Monday’s launch, the booster, upper-stage Centaur tank and payload fairing were made and assembled in Decatur. All told, the Kuiper Project will involve 80 launches – from ULA, SpaceX, Blue Origin and the French company Arianespace. The delay will be unwelcome news for Amazon, which is facing a Federal Communications Commission deadline to launch 1,618 satellites, or just over half of its constellation, by July 2026.