Amazon.com Inc.’s first batch of production satellites reached low-Earth orbit, the biggest step to date in the company’s effort to establish a business broadcasting internet connectivity from space.

Amazon has successfully launched its first satellites for the company’s Project Kuiper internet-from-space service, which will take on SpaceX’s Starlink service.

First, ULA is targeting 7 p.m. to launch the Atlas V — which is outfitted with five solid rocket boosters — and deploy the first production batch of Amazon Project Kuiper broadband satellites into low-Earth orbit. The launch window lasts two hours, until 9 p.m., and the rocket will fly along a northeasterly trajectory.