{"schema_version":1,"airport":"21N","entries":[{"cycle":"2026-03-19","from_cycle":"2026-02-19","id":"6dff442e8eeb","priority":"ifr","category":"route","kind":"changed","summary":"preferred IFR routes: 1 removed","source":"PFR","details":["preferred IFR route BWI -> 21N removed"]},{"cycle":"2025-11-27","from_cycle":"2025-10-30","id":"c816cc6797d9","priority":"fyi","category":"remark","kind":"added","summary":"new remark: Controlling obstruction exceeds 45 degree slope.","source":"APT_RMK","original":"CTLNG OBSTN EXCEEDS 45 DEG SLP."},{"cycle":"2025-11-27","from_cycle":"2025-10-30","id":"8e25a13b51ca","priority":"fyi","category":"runway","kind":"changed","summary":"runway 01: controlling obstacle changed (now 44 ft tall, 209 ft from threshold, 77 ft right of centerline, clearance slope 0:1)","source":"APT_RWY_END","fields":[{"field":"CNTRLN_OFFSET","old":"34","new":"77"},{"field":"DIST_FROM_THR","old":"216","new":"209"},{"field":"OBSTN_HGT","old":"53","new":"44"}]},{"cycle":"2025-11-27","from_cycle":"2025-10-30","id":"12bf42f1ccac","priority":"fyi","category":"runway","kind":"changed","summary":"runway 19: controlling obstacle changed (now 51 ft tall, 360 ft from threshold, 117 ft right of centerline, clearance slope 3:1)","source":"APT_RWY_END","fields":[{"field":"CNTRLN_DIR_CODE","old":"L","new":"R"},{"field":"CNTRLN_OFFSET","old":"53","new":"117"},{"field":"DIST_FROM_THR","old":"223","new":"360"},{"field":"OBSTN_CLNC_SLOPE","old":"0","new":"3"}]},{"cycle":"2024-10-03","from_cycle":"2024-09-05","id":"d6ba3df5135d","priority":"fyi","category":"airport","kind":"changed","summary":"airport phone number changed to 631-445-4348","source":"APT_CON","fields":[{"field":"PHONE_NO","old":"(631) 260-1035","new":"631-445-4348"}]},{"cycle":"2024-10-03","from_cycle":"2024-09-05","id":"52f13d4e3a48","priority":"fyi","category":"remark","kind":"added","summary":"new remark: Call airport manager for permission to land.","source":"APT_RMK","original":"CALL AMGR FOR PMSN TO LND."}],"first_cycle":"2024-10-03","last_cycle":"2026-03-19"}