An Air Canada Boeing 737 MAX 8 (C-GEOJ) exited taxiway B3 into the grass at Montréal-Trudeau International Airport on 9 July 2026 while vacating runway 06L at approximately 55 knots ground speed, failing to execute the turn onto taxiway B during pouring rain and turbulent conditions. The excursion triggered immediate closure of the north runway, activating the airport emergency coordination centre and causing cascading delays averaging 30 minutes for domestic and international flights, with U.S.-bound departures facing setbacks up to one hour. All 156 passengers and six crew remained uninjured but deplaned via stairs after 3.5 hours on board, while the aircraft was towed to a hangar for rigorous technical inspection. The Transportation Safety Board of Canada and Air Canada launched independent investigations to determine whether environmental factors, mechanical issues, or pilot input caused the high-speed taxiway miss.