Overview
- United flight UA949 from London to San Francisco declared a Squawk 7700 emergency about 90 minutes after departure on 4 December due to a burning smell.
- The Boeing 777-200ER diverted to Edinburgh and landed safely with 162 passengers and 12 crew, with no injuries reported.
- United said maintenance teams were investigating the source of the odor and that the aircraft would meet safety standards before returning to service.
- Data from FlightRadar indicates the same aircraft departed Edinburgh for San Francisco on 6 December and subsequently flew additional long-haul sectors.
- Early reports pointed to a possible brake temperature sensor or electrical issue, though the airline has not confirmed a root cause.