Atlas 5-551

ULA launches final Atlas 5 rocket supporting Amazon Leo’s broadband internet satellite constellation

July 1, 2026 Will Robinson-Smith

The Leo Atlas 8 mission was also the final flight of an Atlas 5 551 configuration. Liftoff from pad 41 at Cape Canaveral Space Force Station happened at 12:30:15 a.m. EDT (0430:15 UTC).

ULA launches 29 Amazon Leo satellites on Atlas 5 rocket from Cape Canaveral

May 29, 2026 Will Robinson-Smith

The Leo Atlas 07 mission was the second to last flight that Amazon booked on a United Launch Alliance Atlas 5 rocket. Liftoff from pad 41 at Cape Canaveral Space Force Station happened at 7:53 p.m. EDT (2353 UTC).

ULA’s Atlas 5 rocket launches its heaviest payload ever with fifth Amazon Leo mission

April 3, 2026 Will Robinson-Smith

Liftoff from pad 41 at Cape Canaveral Space Force Station happened Saturday at 1:46 a.m. EDT (0546 UTC).

ULA Atlas 5 launch puts Amazon’s 180th broadband satellite in low Earth orbit

December 15, 2025 Will Robinson-Smith

Liftoff from Space Launch Complex 41 at Cape Canaveral Space Force Station occurred at 3:28 a.m. EST (0828 UTC), as the RD-180 engine on the booster roared to lift alongside five solid rocket boosters.

ULA launches ViaSat-3 following valve replacement on Atlas 5 rocket

November 13, 2025 Will Robinson-Smith

The mission was the second of three planned spacecraft that Viasat plans to operate in geostationary orbit. United Launch Alliance launched from pad 41 at Cape Canaveral Space Force Station at 10:04 p.m. EST (0304 UTC).

Issue with Atlas 5 booster liquid oxygen vent valve causes second scrub of ViaSat-3 F2 launch

November 6, 2025 Spaceflight Now

United Launch Alliance scrubbed a second launch attempt for an Atlas 5 rocket carrying the ViaSat-3 F2 satellite. A new launch date hasn’t been announced.

Atlas booster valve issue scrubs launch of ViaSat-3 F2 satellite

November 5, 2025 Will Robinson-Smith

The mission is the second of three planned spacecraft that Viasat plans to operate in geostationary orbit. United Launch Alliance is targeting liftoff from pad 41 at Cape Canaveral Space Force Station no earlier than Thursday, Nov. 6, at 10:16 p.m. EST (0316 UTC).