American Airlines flight AA109 had to return and make an emergency landing at London’s Heathrow Airport, on January 27.
The Boeing 777 took off for Los Angeles, California, but had to return shortly afterwards after two passengers and several crew members fell ill midair.
The plane, carrying 172 passengers and 16 crew members, landed uneventfully. The patients were evaluated by paramedics.
The airline said, “Our maintenance team conducted a thorough inspection of the aircraft, including a test flight, and found no issues with the Boeing 777-300. Out of an abundance of caution, all of the air filters on the aircraft were replaced.”