Geospatial data for Mexico City public transport system (Metro, Metrobús, Cablebús, RTP, etc.).
Apimetro 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.

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164,068 aircraft accident narratives from 128 official investigation authorities, plus FAA data
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Yes. The Apimetro 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 Apimetro API requires no authentication, so you can start making requests without signing up.
Yes. The Apimetro API supports CORS, so front-end JavaScript can call it directly.
Yes. The Apimetro API is served over HTTPS, so it's safe to use in production.