The fifth launch of the United Launch Alliance Atlas V 551 rocket has been delayed until a new date is finalized, according to officials at Cape Canaveral. The mission, which was scheduled for early Sunday, March 29, 2026, was postponed due to predicted inclement weather conditions. The rocket and spacecraft are in good health, and the new launch window will depend on range approvals and coordination with NASA’s Artemis II mission. The delay comes as part of ongoing efforts to ensure safety during the launch window.
The mission is part of Amazon’s Leo constellation, which aims to deploy more than 3,000 satellites to provide broadband internet globally, with a focus on unserved and underserved communities. The Leo 5 batch is the latest in a series of launches designed to expand the company’s satellite-based internet system. The satellites will be deployed from low Earth orbit and are expected to enhance connectivity in rural and remote areas across the globe.
Officials said the new launch date will be announced once final approvals are secured. The Artemis II mission, which is also scheduled for launch from the same site, requires deconfliction to avoid overlapping operations. The delay is not uncommon during the launch season, as weather forecasts often influence timing. The next update on the mission is expected within the next 48 hours, with additional details on viewing opportunities and weather conditions to be released closer to the launch.
The delay has no impact on the overall timeline for the Leo constellation, which is progressing as planned. The mission is one of several launches this year aimed at expanding global broadband access. The Atlas V rocket has a strong track record of successful missions, and the team is confident in the spacecraft’s readiness once the new launch window is set.