{"schema_version":1,"from_cycle":"2026-09-03","to_cycle":"2026-10-01","airport":"4AK","counts":{"action":6,"ifr":0,"fyi":0},"changes":[{"id":"64b6f4f8e854","priority":"action","category":"tower","kind":"changed","summary":"approach/departure control:  -> ZAN; apch p prov type cd: (none) -> C; dep p prov type cd: (none) -> C; primary apch radio call: (none) -> ANCHORAGE ARTCC; primary dep radio call: (none) -> ANCHORAGE ARTCC","source":"ATC_BASE","fields":[{"field":"APCH_P_PROVIDER","old":"","new":"ZAN"},{"field":"APCH_P_PROV_TYPE_CD","old":"","new":"C"},{"field":"DEP_P_PROVIDER","old":"","new":"ZAN"},{"field":"DEP_P_PROV_TYPE_CD","old":"","new":"C"},{"field":"PRIMARY_APCH_RADIO_CALL","old":"","new":"ANCHORAGE ARTCC"},{"field":"PRIMARY_DEP_RADIO_CALL","old":"","new":"ANCHORAGE ARTCC"}]},{"id":"31d5e31860ba","priority":"action","category":"frequency","kind":"removed","summary":"frequency 125.2 (BETHEL RCAG): discontinued","source":"FRQ"},{"id":"794df5dd23d9","priority":"action","category":"frequency","kind":"removed","summary":"frequency 372.0 (BETHEL RCAG): discontinued","source":"FRQ"},{"id":"640e57319da1","priority":"action","category":"frequency","kind":"added","summary":"new frequency 120.9 (MURPHY DOME RCAG)","source":"FRQ"},{"id":"3d5e763f61dd","priority":"action","category":"frequency","kind":"added","summary":"new frequency 319.2 (MURPHY DOME RCAG)","source":"FRQ"},{"id":"62a12433da3d","priority":"action","category":"remark","kind":"changed","summary":"revised tower/ATC remark: Approach and departure service provided by Anchorage ARTCC (ZAN) on frequencies 120.9/319.2 (MURPHY DOME RCAG).","source":"ATC_RMK","original":"APCH/DEP SVC PRVDD BY ANCHORAGE ARTCC (ZAN) ON FREQS 120.9/319.2 (MURPHY DOME RCAG).","fields":[{"field":"REMARK","old":"APCH/DEP CTL SVC PRVVD BY ANCHORAGE CENTER (ZAN) ON 125.2/372.0 (BETHEL RCAG).","new":"APCH/DEP SVC PRVDD BY ANCHORAGE ARTCC (ZAN) ON FREQS 120.9/319.2 (MURPHY DOME RCAG)."}]}]}