Promise Ledger
Spaceplane and habitat company (Dream Chaser). These are the dated public commitments by Sierra Space and its people that we could source to a primary, with what happened.
2 entries: 1 met; 1 revised.
Plain counts, not a grade or a ranking. A short record is not a complete one. Updated Sep 28, 2026; each entry shows the date it was last checked against its source; 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 commitment
First flight · Sierra Space
“The Dream Chaser will go to the space station for at least six cargo resupply missions starting in 2020”
Said . Source: Sierra Nevada Corporation: Sierra Nevada Corporation’s Dream Chaser® Spacecraft Passes Major NASA Milestone after Free-Flight Test (Jan 5, 2018, paragraph 2)
Context: Release by Sierra Nevada Corporation (SNC), whose space division became Sierra Space in 2021.
Later dated commitments for the same milestone
The counts use the original commitment. The latest date in the chain stands as: pending.
Outcome: On 2025-11-13 Sierra Space said the first launch is targeted in Q4 of 2026; the deadline has not passed.
Outcome source: Sierra Space: Sierra Space's Dream Chaser Spaceplane Successfully Completes Critical Pre-flight Milestones (Nov 13, 2025)
Checked against the source on Sep 26, 2026. Report a correction or send a response to this entry ·
Met · worded as a target
Other milestone · Sierra Space
“Scheduled for December 2023 at the NASA Marshall Space Flight Center in Huntsville, Ala., the Ultimate Burst Pressure (UBP) test”
Said . Source: Sierra Space: Sierra Space Sets the Stage for Pioneering Full-Scale 'Burst Test' of Expandable Space Station Module (Nov 13, 2023)
Context: First full-scale ultimate burst pressure test of Sierra Space's LIFE expandable habitat (Orbital Reef program).
Outcome: Sierra Space announced on 2023-12-21 that it had completed the first full-scale ultimate burst pressure test at NASA Marshall. The exact test day was not stated; 2023-12-21 is the announcement date. (, on or before the deadline)
Outcome source: Sierra Space on X: Our team has completed the first ever, full-scale ultimate burst pressure test (Dec 21, 2023)
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). Archived on Zenodo, DOI 10.5281/zenodo.22985970. 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.
Cite as: SpaceNexus. (2026). SpaceNexus Promise Ledger (Version 2026-09-28) [Data set]. https://doi.org/10.5281/zenodo.22985970. Licensed CC BY 4.0.
The whole Promise Ledger, with every organisation and person, and the topic trackers.
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