LONDON, United Kingdom — A technical meltdown tied to airline check-in software rippled through three of Europe’s busiest aviation hubs this weekend, leaving travelers in London, Brussels and Berlin juggling last-minute schedule changes and crowded terminals.

Travelers planning to fly through Brussels Airport should brace for significant disruptions as the airport has announced the cancellation of 30% of its flights due to a nationwide strike. This strike, which has been organized by various labor unions, is aimed at addressing ongoing concerns regarding working conditions and wages across multiple sectors in Belgium.