{"schema_version":1,"airport":"B18","entries":[{"cycle":"2026-09-03","from_cycle":"2026-08-06","id":"d88951e28831","priority":"fyi","category":"airport","kind":"changed","summary":"name changed: Alton Bay -> Alton Bay Spb & Ice Rwy","source":"APT_BASE","fields":[{"field":"ARPT_NAME","old":"ALTON BAY","new":"ALTON BAY SPB & ICE RWY"}]},{"cycle":"2026-04-16","from_cycle":"2026-03-19","id":"8a27c63fef97","priority":"fyi","category":"remark","kind":"changed","summary":"remark updated: FOR SEAPLANE PRKG & ICE RWY CONDS CALL 603-271-7398.","source":"APT_RMK","original":"FOR SEAPLANE PRKG & ICE RWY CONDS CALL 603-271-7398.","fields":[{"field":"REMARK","old":"FOR SEAPLANE PRKG & ICE RWY CONDS CALL AMGR 603-545-2315.","new":"FOR SEAPLANE PRKG & ICE RWY CONDS CALL 603-271-7398."}]},{"cycle":"2026-01-22","from_cycle":"2025-12-25","id":"8556dc6d7749","priority":"fyi","category":"remark","kind":"changed","summary":"remark updated: RWY 01W/19W HAS ICE IN WINTER PLOWED TO APRXLY 2600 FT. CK NOTAMS FOR ICE RWY CONDS.","source":"APT_RMK","original":"RWY 01W/19W HAS ICE IN WINTER PLOWED TO APRXLY 2600 FT. CK NOTAMS FOR ICE RWY CONDS.","fields":[{"field":"REMARK","old":"RWY 01W/19W HAS ICE IN WINTER PLOWED TO APRXLY 2730 FT. CK NOTAMS FOR ICE RWY CONDS.","new":"RWY 01W/19W HAS ICE IN WINTER PLOWED TO APRXLY 2600 FT. CK NOTAMS FOR ICE RWY CONDS."}]},{"cycle":"2026-01-22","from_cycle":"2025-12-25","id":"dec6b57809b6","priority":"fyi","category":"runway","kind":"changed","summary":"runway 01W: controlling obstacle changed (now 26 ft tall, 100 ft from threshold, 119 ft left of centerline, clearance slope 3:1); controlling obstacle: BLDG -> POLE","source":"APT_RWY_END","fields":[{"field":"CNTRLN_OFFSET","old":"109","new":"119"},{"field":"DIST_FROM_THR","old":"161","new":"100"},{"field":"OBSTN_CLNC_SLOPE","old":"13","new":"3"},{"field":"OBSTN_HGT","old":"12","new":"26"},{"field":"OBSTN_TYPE","old":"BLDG","new":"POLE"}]}],"first_cycle":"2026-01-22","last_cycle":"2026-09-03"}