ArcNautical
Screen any ship by IMO for OFAC/EU/UN/UK sanctions, ownership opacity and a vetting grade

164,068 aircraft accident narratives from 128 official investigation authorities, plus FAA data.
Aviation Safety Data API is a free Transportation API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Free JSON API over a merged aviation-safety corpus: accident narratives from 80+ official investigation agencies, occurrence-level dedup, family safety stats. Self-serve keys, OpenAPI 3 spec.
Details from himaxym.com.

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Screen any ship by IMO for OFAC/EU/UN/UK sanctions, ownership opacity and a vetting grade
FAA Aeronautical Charts and Publications, Airport Information, and Airport Weather
Geospatial data for Mexico City public transport system (Metro, Metrobús, Cablebús, RTP, etc.)
The Aviation Safety Data API is provided by FlightFinder (himaxym.com). Free JSON API over a merged aviation-safety corpus: accident narratives from 80+ official investigation agencies, occurrence-level dedup, family safety stats. Self-serve keys, OpenAPI 3 spec.
Yes. The Aviation Safety Data API is listed in the Transportation category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Aviation Safety Data API requires no authentication, so you can start making requests without signing up.
Yes. The Aviation Safety Data API supports CORS, so front-end JavaScript can call it directly.
Yes. The Aviation Safety Data API is served over HTTPS, so it's safe to use in production.