A 767-300ER aircraft owned by American Airlines encountered an unknown odour onboard while crossing the Atlantic Ocean around 390nm southwest of Shannon. The aircraft was flying from Madrid (Spain) to New York JFK Airport with 170 people on board. The aircraft diverted to Shannon for a safe landing on runway 24, about an hour after first noticing the odour. The crew had to put on their oxygen masks.
The airline confirmed the aircraft diverted to Shannon due to an unknown odour on board, a number of passengers and crew needed medical assessment due to feeling unwell, however, nobody needed to be transported to a hospital.
The remainder of the flight was postponed to the next day as the aircraft is being checked in Shannon.