OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 12 shown for “Photograph of airmail hanger at Rock Springs, Wyoming” — 41 records examined, 12 dropped by the rights gate.
Archives queried 2026-09-01 16:02 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Photograph of airmail hanger at Rock Springs, Wyoming
Artist not stated in the record · c. 1920
Photograph of airmail hanger at Iowa City, Iowa
Artist not stated in the record · 1921
Photograph of airmail hanger in North Platte, Nebraska
Artist not stated in the record · c. 1924
Photograph of airmail planes at Elko, Nevada
Artist not stated in the record · c. 1920
Photograph of postal clerk sorting airmail
Artist not stated in the record · c. 1920
Airmail schedule dispatch board
Artist not stated in the record · c. 1918-1929
Distichlis spicata subsp. stricta
Artist not stated in the record · 29 Jun 1901
Photograph of airmail office at Chicago
Artist not stated in the record · 1920
Photograph of airmail planes at Washington, DC
Artist not stated in the record · 1918
Photograph of airmail planes at Omaha, Nebraska
Artist not stated in the record · c. 1927
Photograph of airmail pilot E. Hamilton Lee
Artist not stated in the record · c. 1924
Photograph of airmail plane at Chicago
Artist not stated in the record · c. 1920
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 1 matched · 1 examined · 1 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.0 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 3056628 matched · 40 examined · 11 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-09-01 16:02 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.