{"schema_version":1,"airport":"4J1","entries":[{"cycle":"2026-09-03","from_cycle":"2026-08-06","id":"fd1a45b2363d","priority":"fyi","category":"runway","kind":"changed","summary":"runway 01: controlling obstacle changed (now 58 ft tall, 1259 ft from threshold, 372 ft right of centerline, clearance slope 18:1)","source":"APT_RWY_END","fields":[{"field":"CNTRLN_OFFSET","old":"240","new":"372"},{"field":"DIST_FROM_THR","old":"201","new":"1259"},{"field":"OBSTN_CLNC_SLOPE","old":"0","new":"18"},{"field":"OBSTN_HGT","old":"20","new":"58"}]}],"first_cycle":"2026-09-03","last_cycle":"2026-09-03"}