Atlas 5 Family rocket variant.
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A United Launch Alliance Atlas V 531 rocket launched the Boeing-built SES-20 and SES-21 satellites into near-geosynchronous operations on 2022-10-04 at 5:36 p.m. EDT from Space Launch Complex-41 at Cape Canaveral Space Force Station, Florida.
The Boeing-built C-band satellites launched on the Atlas V 531 will enable SES to continue providing data and television transmission services to nearly 120 million American homes.