# ULA's final Atlas V 551 rocket retires after 110th flight, deploying 29 Amazon Leo satellites
> The last Atlas V in the 551 heavy-lift configuration launched 29 Amazon Leo broadband satellites from Cape Canaveral at 12:30 a.m. EDT on July 2, completing the 110th mission of the 24-year Atlas V programme with a perfect success record

**Meta:** type: event · date: 2026-07-02 · heads: 静かな変化, 誰の金か · 6 takes · 3 lenses · 3 regions

## Summary

United Launch Alliance retired its Atlas V 551 heavy-lift rocket configuration on July 2, 2026, after the vehicle successfully delivered 29 [Amazon](/ja/entity/corporate/amazon) Leo broadband satellites to low Earth orbit, completing the 110th and final Atlas V mission in that variant. The rocket lifted off at 12:30 a.m. EDT from Space Launch Complex 41 at Cape Canaveral Space Force Station. The 551 configuration, which uses a five-metre fairing, five solid rocket boosters and a Centaur upper stage, maintained a 100% mission success record across 24 years of service and a manifest that included the New Horizons Pluto probe, the Mars Reconnaissance Orbiter and the Perseverance Mars rover. With this launch, Amazon's Leo constellation reaches 396 satellites; the company faces a Federal Communications Commission deadline of July 30, 2026 to demonstrate that roughly half its planned 3,236-satellite network is operational. ULA is transitioning to the Vulcan rocket, which has flown fewer than 10 times, for future Amazon Leo missions; remaining Atlas V inventory is reserved for Boeing Starliner crewed flights to the International Space Station.

## The split

US spaceflight media framed the final Atlas V 551 as an end-of-era milestone with genuinely bipartisan sentiment: the rocket served both national security payloads and civilian science across five administrations. The commercial angle focuses on Amazon's race with SpaceX's Starlink, which has roughly 7,000 satellites operational and generates revenue from aviation, maritime and residential customers. European space industry coverage was limited, reflecting that the Atlas V programme does not directly compete with Ariane or Vega. No significant coverage from China or Russia was identified, though the Atlas V's history includes payloads linked to missile warning, signals intelligence and GPS systems that are directly relevant to both countries' strategic calculations.

## By the numbers

- 110, total Atlas V missions across all configurations since 2002
- 100%, Atlas V 551 mission success rate
- 29, Amazon Leo satellites deployed on the final flight
- 396, total Amazon Leo satellites now in orbit
- 3,236, Amazon Leo target constellation size at full build-out
- July 30, 2026, FCC deadline for Amazon to have roughly half its constellation operational
- 5, solid rocket boosters on the 551 configuration (the heaviest Atlas V variant)

## Why it matters

The Atlas V's retirement is a structural moment in the transition from established US launch providers to a SpaceX-dominant commercial launch market. ULA, a joint venture of Boeing and Lockheed Martin, flew the Atlas V as its primary workhorse for national security and science missions, and its perfect record made it the US government's most trusted heavy-lift vehicle for irreplaceable payloads. The transition to Vulcan, which is newer and less proven, creates a reliability question at exactly the moment the US Space Force is increasing its dependence on domestic launch capacity for next-generation GPS, communications and surveillance satellites. Amazon's broadband race with Starlink is the immediate commercial stakes: the FCC July 30 deadline means that delays in Vulcan's maturation timeline directly threaten Amazon's launch license.

## What to watch

- Whether Vulcan's next scheduled flights maintain Atlas V's reliability standard, or suffer teething problems that delay Amazon's constellation build-out
- Amazon's commercial service launch: whether it meets the end-of-2026 target for early subscribers
- The national security implications of retiring a 100%-reliable launcher before Vulcan is fully proven
- Whether SpaceX's lead in satellite broadband continues to widen against Amazon's slower constellation build-out pace

## Regional takes (batched by bias / lens)

### unlabelled
- **United Launch Alliance (newsroom)** (United States, en) — ULA's official mission confirmation: Atlas V 551 (AV-114) lifted off from Space Launch Complex 41 at 12:30 a.m. EDT, July 2. All 29 Amazon Leo satellites deployed successfully to low Earth orbit. The flight was the 110th Atlas V and the final mission for the 551 heavy-lift configuration, which carries a 5-meter fairing, five solid rocket boosters and a single Centaur upper stage. ULA confirmed the 551 has a perfect 100% mission success record. Remaining Atlas V inventory is reserved exclusively for Boeing Starliner crewed missions.
  Source: https://newsroom.ulalaunch.com/releases/united-launch-alliance-successfully-delivers-29-broadband-satellites-for-amazon-leo
- **Click Orlando** (United States, en) — 
  Source: https://www.clickorlando.com/news/space-news/2026/07/02/ula-atlas-v-rocket-launches-29-amazon-leo-broadband-satellites/
- **Crypto Briefing** (International, en) — 
  Source: https://cryptobriefing.com/amazon-satellite-launch-broadband-constellation/
- **Azat TV** (Kazakhstan, en) — 
  Source: https://azat.tv/en/ula-retires-atlas-v-551-after-final-amazon-leo-mission/

### Dedicated spaceflight media
- **Spaceflight Now** (United States, en) — Live coverage and mission recap confirming the 110th Atlas V launch, the retirement of the 551 configuration, and Amazon Leo's trajectory toward early commercial service. Reported that Amazon now has 396 satellites in orbit across 9 Atlas V missions and must meet an FCC deadline of July 30, 2026 to have roughly half its planned 3,236-satellite constellation operational to retain its launch licenses. Vulcan will replace Atlas V for future Amazon Leo missions.
  > "ULA launched the final Atlas 5 rocket supporting Amazon Leo's broadband internet satellite constellation, completing the 110th Atlas V mission with a perfect success record."
  Source: https://spaceflightnow.com/2026/07/01/live-coverage-ula-to-launch-final-atlas-5-rocket-supporting-amazon-leos-broadband-internet-satellite-constellation/

### General space media
- **Space.com** (United States, en) — Contextualised the final Atlas V 551 as an end-of-era for a rocket that began flying in 2002 and carried the New Horizons Pluto probe, the Mars Reconnaissance Orbiter, the Perseverance rover and multiple national security payloads. Noted that the Atlas V's perfect mission record, across a diverse range of payload classes, makes its retirement commercially bittersweet: ULA is transitioning to the Vulcan rocket, which has flown fewer than ten times, to compete with SpaceX's Falcon 9.
  > "The Atlas V 551 launched 29 Amazon Leo satellites to close out its career, completing the 110th Atlas V mission."
  Source: https://www.space.com/space-exploration/launches-spacecraft/ula-atlas-v-amazon-leo-8-internet-satellite-launch

## Across the graph
- Related: [[amazon-project-rainier-anthropic-2026]]
- Entities: Corporate:amazon, United States

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