generated: '2026-07-28'
method: searched
source: >-
  https://github.com/usdot-jpo-ode/wzdx/releases (GitHub Releases API, read 2026-07-28),
  https://apim-api.apic4e.faa.gov/portal/environments/DEFAULT/apis (Gravitee portal
  catalog created_at/updated_at, read anonymously 2026-07-28),
  openapi/*.yml info.version, https://dev.socrata.com/changelog/
summary: >-
  U.S. DOT publishes no API changelog. No release notes page, no "what's new" feed, no
  dated version history for any of the FAA, BTS or DOT Data Hub APIs. The only dated,
  structured change history the department itself maintains is on GitHub, for
  SPECIFICATIONS rather than services — the Work Zone Data Exchange releases. Everything
  else below is reconstructed from timestamps the FAA API gateway exposes in its public
  catalog, which is a change signal, not a changelog.
scheme: none
scheme_note: >-
  Versions live in OpenAPI info.version (FAA), in the URL path (Socrata /resource is
  SODA 2.1; CKAN /api/3), or in a GitHub tag (WZDx). No surface negotiates version by
  header or date, and no surface runs more than one version concurrently.
current_versions:
- api: us-dot:faa-airport-status-web-service
  version: 1.2.1
- api: us-dot:faa-aeronautic-product-release-api
  version: 1.4.0
- api: us-dot:faa-air-carrier-prd-api
  version: v1
- api: us-dot:faa-safety-assurance-system-api
  version: 1.0.0
- api: us-dot:its-jpo-ode-rest-api
  version: 0.0.1
- api: [us-dot:dot-data-hub-soda-api, us-dot:bts-open-data-soda-api]
  version: SODA 2.1
- api: us-dot:faa-data-catalog-ckan-api
  version: CKAN 2.11.4
changelogs:
- name: WZDx Specification releases
  url: https://github.com/usdot-jpo-ode/wzdx/releases
  operator: USDOT ITS Joint Program Office
  kind: dated-github-releases
  covers: json-schema/us-dot-wzdx-4.2-*.json
  verified: '2026-07-28'
- name: Socrata (Tyler Data & Insights) platform changelog
  url: https://dev.socrata.com/changelog/
  operator: Tyler Data & Insights
  kind: dated-platform-changelog
  covers: [us-dot:dot-data-hub-soda-api, us-dot:bts-open-data-soda-api]
  note: >-
    The platform vendor's changelog, not DOT's. Relevant because DOT's two largest API
    surfaces are Socrata tenancies and inherit every platform change.
- name: FAA Gravitee portal catalog timestamps
  url: https://apim-api.apic4e.faa.gov/portal/environments/DEFAULT/apis?page=1&size=200
  kind: machine-readable-change-signal
  note: >-
    Not a changelog, but the only per-API change signal the FAA emits. Each catalog entry
    carries created_at and updated_at. Poll it to detect that an FAA API definition
    changed; the catalog will not tell you what changed.
entries:
- version: v4.2
  name: WZDx Specification v4.2
  date: '2023-02-14'
  artifact: json-schema/us-dot-wzdx-4.2-*.json
  source: https://github.com/usdot-jpo-ode/wzdx/releases
- version: v4.1
  name: WZDx Specification v4.1
  date: '2022-09-19'
  source: https://github.com/usdot-jpo-ode/wzdx/releases
- version: v4.0
  name: WZDx Specification v4.0
  date: '2021-12-15'
  breaking: true
  source: https://github.com/usdot-jpo-ode/wzdx/releases
- version: v3.1
  name: WZDx Specification v3.1
  date: '2021-04-06'
  source: https://github.com/usdot-jpo-ode/wzdx/releases
- version: v3.0
  name: WZDx Specification v3.0
  date: '2020-09-18'
  breaking: true
  source: https://github.com/usdot-jpo-ode/wzdx/releases
- version: v2.0
  name: WZDx Specification v2.0
  date: '2020-01-14'
  breaking: true
  source: https://github.com/usdot-jpo-ode/wzdx/releases
- version: v1.1
  name: WZDx Specification v1.1
  date: '2019-12-30'
  source: https://github.com/usdot-jpo-ode/wzdx/releases
faa_catalog_change_signals:
- api: Air Carrier PRD API
  created_at: '2026-03-30'
  updated_at: '2026-07-09'
- api: Safety Assurance System (SAS) API
  created_at: '2026-02-27'
  updated_at: '2026-04-21'
gaps:
- No dated changelog for the FAA ASWS or APRA services, whose 34 chart products change on a 28/56-day AIRAC cycle.
- No changelog for the DOT Data Hub or BTS Socrata tenancies. Per-dataset `modified` in /data.json is the only signal.
- No RSS or Atom feed for API changes anywhere in the department. The only subscription surface is a human email list at https://www.faa.gov/data/subscribe.