a designated area within a flight information region where air traffic advisory service is available
a specifically defined airspace for which air defence must be planned and provided, piiritletud õhuruum, milles planeeritakse ja tagatakse õhukaitse
ADA . Lennunduse terminibaas. Институт эстонского языка, Сынавееб 2026. https://127.0.0.1:5577/search/unif//len/ADA/1/eng (09.10.2026)