Current aviation weather observation (METAR) for one or more airports. Pass ids = comma-separated ICAO station ids (e.g. KATL, EGLL, KJFK). Returns the raw METAR plus decoded fields: flight category (VFR/MVFR/IFR/LIFR), temperature + dewpoint (°C), wind direction/speed/gust (kt), visibility, altimeter (inHg), and cloud layers. Source: NOAA Aviation Weather Center (keyless, public domain).