Get name and website-URL for airports by ICAO code.
airportsapi is a free Transportation API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Yes. The airportsapi 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 airportsapi requires no authentication, so you can start making requests without signing up.
CORS support for the airportsapi is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The airportsapi is served over HTTPS, so it's safe to use in production.