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Watch Live - Atlas V Launches Amazon Leo (LA-06) - Commentary

The live broadcast from Space Launch Complex 41 captured United Launch Alliance’s Atlas V (551 configuration) lifting off with 29 Amazon Leo satellites, marking the sixth Atlas‑based and tenth overall launch for Amazon’s low‑Earth‑orbit broadband constellation. The payload, weighing roughly 16.8 metric tons, represents the heaviest configuration the Atlas V can carry, using a five‑meter fairing, five solid rocket boosters, and a single RL10‑powered Centaur upper stage. Key data points include an 85% go‑for‑launch weather rating, a 29‑minute launch window targeting 8:52 p.m. EDT, and the fact that Amazon has contracted 92 launches across ULA, Arianespace, Blue Origin, and SpaceX to deploy a planned 3,200‑satellite network. The mission also coincides with the 100th orbital launch attempt of 2026, underscoring the high cadence of commercial space activity. During the commentary, the host highlighted the Atlas V’s reliance on the Russian‑designed RD‑180 engine, noting that the remaining supply is finite and that ULA secured all needed engines before 2021. This engine heritage, traced back to the Soviet RD‑170, is a primary driver behind ULA’s development of the new Vulcan rocket, which will replace the Atlas V. The successful lift‑off advances Amazon’s broadband ambitions, strengthens ULA’s launch record, and illustrates the transitional phase in U.S. launch capability as legacy Russian‑engine rockets are phased out in favor of domestically produced alternatives, affecting timelines and competitive dynamics in the satellite‑internet market.