{"schema_version":1,"airport":"M21","entries":[{"cycle":"2026-04-16","from_cycle":"2026-03-19","id":"f52228609856","priority":"fyi","category":"runway","kind":"changed","summary":"runway 06: controlling obstacle changed (now 80 ft tall, 1745 ft from threshold, 417 ft left of centerline, clearance slope 19:1)","source":"APT_RWY_END","fields":[{"field":"CNTRLN_OFFSET","old":"220","new":"417"},{"field":"DIST_FROM_THR","old":"1501","new":"1745"},{"field":"OBSTN_CLNC_SLOPE","old":"17","new":"19"},{"field":"OBSTN_HGT","old":"73","new":"80"}]}],"first_cycle":"2026-04-16","last_cycle":"2026-04-16"}