A British Airways Boeing 777 on a transatlantic route to Chicago declared an emergency on October 5, 2026, after losing around 27,000 feet of altitude rapidly. The aircraft diverted and landed back at London without incident. Cabin depressurization was identified as the reason for the emergency.

A passenger on board reported a sudden drop in altitude and pressure during the incident. The alarming event unfolded over the Atlantic before the crew made the decision to divert. The flight's diversion was covered by several news organizations including Sky News, CBS News, and The Guardian.