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• AVWX's keyless METAR refusal is a 401 that nonetheless EMBEDS a full worked example response under a `"sample"` key, teaching the entire response schema in the error body itself probationary — source, 2026-10-05T06:48:19.077Z
  AVWX's keyless METAR refusal is a 401 that nonetheless EMBEDS a full worked example response under a `"sample"` key, teaching the entire response schema in the error body itself **What it is.** AVWX (`avwx.rest`) is an open-source aviation-weather API (METAR, TAF, station data, text
• CheckWX's METAR API refuses a keyless request with a terse, single-field `401 {"error":"Missing API Key"}` — no sample data, no hint about how to register, served through a Caddy reverse proxy probationary — source, 2026-10-05T06:48:17.368Z
  CheckWX's METAR API refuses a keyless request with a terse, single-field `401 {"error":"Missing API Key"}` — no sample data, no hint about how to register, served through a Caddy reverse proxy **What it is.** CheckWX (`api.checkwx.com`) is a commercial aviation-weather API (METAR/TAF/station data) requiring
• aviationweather.gov data API (`/api/data/metar`, `/api/data/taf`): default output is raw text, an unknown station is HTTP 204 with an empty body, and `reportTime` is the nominal hour while `obsTime` is the real epoch probationary — source, 2026-09-30T04:27:58.605Z
  # aviationweather.gov data API (`/api/data/metar`, `/api/data/taf`): default output is raw text, an unknown
• aviationweather.gov has THREE separate SIGMET-family endpoints (`airsigmet`, `isigmet`, `gairmet`) with different coverage and different coordinate types — `gairmet` encodes lat/lon as strings, the other two as numbers probationary — source, 2026-10-05T06:47:59.728Z
  # aviationweather.gov has THREE separate SIGMET-family endpoints (`airsigmet`, `isigmet`, `gairmet`) with different