{"schema_version":1,"airport":"SDY","entries":[{"cycle":"2026-09-03","from_cycle":"2026-08-06","id":"3609c32498e7","priority":"action","category":"remark","kind":"removed","summary":"remark removed: COMMUNICATIONS PRVDD BY GREAT FALLS RADIO ON FREQ 122.3 (SIDNEY RCO).","source":"ATC_RMK","original":"COMMUNICATIONS PRVDD BY GREAT FALLS RADIO ON FREQ 122.3 (SIDNEY RCO)."},{"cycle":"2026-09-03","from_cycle":"2026-08-06","id":"e523399f7e93","priority":"fyi","category":"frequency","kind":"removed","summary":"flight service (FSS) 122.3 via the Sidney outlet no longer available","source":"FRQ"},{"cycle":"2026-09-03","from_cycle":"2026-08-06","id":"b5a6ab10d09c","priority":"fyi","category":"remark","kind":"changed","summary":"remark updated: FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.","source":"APT_RMK","original":"FOR CD CTC SALT LAKE ARTCC AT 801-320-2568.","fields":[{"field":"REMARK","old":"FOR CD IF UNA TO CTC ON FSS FREQ, CTC SALT LAKE ARTCC AT 801-320-2568.","new":"FOR CD CTC SALT LAKE ARTCC AT 801-320-2568."}]},{"cycle":"2025-12-25","from_cycle":"2025-11-27","id":"a61b89a9e43d","priority":"fyi","category":"runway","kind":"changed","summary":"runway 01: runway end elevation: 1982.6 -> 1982.4 ft MSL; touchdown zone elevation: 1985.3 -> 1985.1 ft MSL","source":"APT_RWY_END","fields":[{"field":"RWY_END_ELEV","old":"1982.6","new":"1982.4"},{"field":"TDZ_ELEV","old":"1985.3","new":"1985.1"}]},{"cycle":"2025-12-25","from_cycle":"2025-11-27","id":"d9b0c5d7205d","priority":"fyi","category":"runway","kind":"changed","summary":"runway 11: runway end elevation: 1980.6 -> 1980.7 ft MSL; touchdown zone elevation: 1981 -> 1981.1 ft MSL","source":"APT_RWY_END","fields":[{"field":"RWY_END_ELEV","old":"1980.6","new":"1980.7"},{"field":"TDZ_ELEV","old":"1981","new":"1981.1"}]},{"cycle":"2025-12-25","from_cycle":"2025-11-27","id":"44687c71821c","priority":"fyi","category":"runway","kind":"changed","summary":"runway 19: runway end elevation: 1980.6 -> 1980.7 ft MSL; touchdown zone elevation: 1981 -> 1981.1 ft MSL","source":"APT_RWY_END","fields":[{"field":"RWY_END_ELEV","old":"1980.6","new":"1980.7"},{"field":"TDZ_ELEV","old":"1981","new":"1981.1"}]},{"cycle":"2025-12-25","from_cycle":"2025-11-27","id":"cd957f3fda57","priority":"fyi","category":"runway","kind":"changed","summary":"runway 29: runway end elevation: 1966.4 -> 1966.5 ft MSL; touchdown zone elevation: 1980.8 -> 1980.9 ft MSL","source":"APT_RWY_END","fields":[{"field":"RWY_END_ELEV","old":"1966.4","new":"1966.5"},{"field":"TDZ_ELEV","old":"1980.8","new":"1980.9"}]}],"first_cycle":"2025-12-25","last_cycle":"2026-09-03"}