Severe thunderstorms on 30 June and 1 July 2026 forced 70 flight cancellations or delays at Zurich Airport, correcting the initial misattribution to Munich. Operators extended operating hours to 23:30 to accommodate 14 arrivals and 15 departures after ground stops ended. The sector faces heightened vulnerability as extreme weather events increase with climate change, directly impacting MTOW calculations and bypass ratio efficiency during rerouting. Munich experienced regional warnings but no comparable disruption scale. This incident underscores the need for operational flexibility in STC compliance and AOG management when natural disasters impair airport infrastructure. Airlines must adjust flight plans dynamically while ensuring passenger notifications meet regulatory standards under EC 261.