AirLabs Cities API

The AirLabs Cities API exposes a single GET /cities endpoint that returns a list of cities filterable by IATA city_code, ISO 2 country_code, or comma-separated _fields. Free-tier responses include name, city_code, latitude, longitude, and country_code; paid tiers add UN/LOCODE, elevation, timezone, population, multilingual names, Wikipedia links, and SEO slugs. Authentication uses the api_key query parameter.