Promise Ledger
Launch provider (Atlas V, Vulcan). These are the dated public commitments by United Launch Alliance and its people that we could source to a primary, with what happened.
1 entry: 1 revised.
Plain counts, not a grade or a ranking. A short record is not a complete one. Checked against sources on Sep 26, 2026; scoring rules on the methodology page.
This first release is a selection, and a short record is not a complete record. Each programme milestone enters the ledger at its earliest dated public commitment we can find in a primary source, for governments and companies alike. Later dated commitments for the same milestone are shown on that one entry as a revision chain, oldest first, rather than as separate entries.
Revised · worded as a target
First flight · United Launch Alliance
“Development is on schedule to achieve qualification for flight in 2017 to support the first Vulcan flight in 2019.”
Said . Source: United Launch Alliance: ULA and Blue Origin Announce Production Agreement for American-Made BE-4 Engine (Sep 10, 2015, paragraph 2)
Context: Joint ULA and Blue Origin release on the BE-4 production agreement; 'Development' refers to the BE-4 engine.
Later dated commitments for the same milestone
The counts use the original commitment. The latest date in the chain stands as: met.
Outcome: Vulcan first flew on 2024-01-08 (Cert-1, carrying Astrobotic's Peregrine lander). (, on or before the latest deadline)
Outcome source: United Launch Alliance: Vulcan launches the first certification mission (Cert-1) (Jan 8, 2024)
Checked against the source on Sep 26, 2026. Report a correction or send a response to this entry
Open data: download the whole ledger (CSV, CC BY 4.0). Cite as “SpaceNexus Promise Ledger” with a link. How entries are scored: methodology. No sponsor, advertiser or partner can add, remove, reorder, annotate or preview an entry, and these pages carry no advertising.
The whole Promise Ledger, with every organisation and person, and the topic trackers.
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