An American Airlines Boeing 787 Dreamliner flying from Zurich to Philadelphia makes an unscheduled landing at London Heathrow after an in-flight emergency. Multiple reports say the aircraft encounters trouble during the flight and declares an emergency mid-air. The plane, a Boeing 787-8 Dreamliner that typically carries around 234 passengers, diverts to Heathrow rather than continuing to its planned destination. The diversion is described as being prompted by a medical emergency aboard the flight, though both accounts focus on the need for an urgent landing. The flight ultimately heads to Heathrow Airport in London to allow for further assistance and procedures following the emergency. The reports do not provide details on the specific cause of the medical situation or the condition of those affected. Both outlets characterize the event as an emergency that results in the aircraft landing at Heathrow, rather than arriving in Philadelphia as scheduled.