It was an emergency. An American Airlines Boeing 767-300, registration N376AN performing flight AA-78 from Dallas Ft. Worth,TX (USA) to London Heathrow,EN (UK) with 161 passengers and 12 crew, was enroute over the Atlantic having passed N54 W30 at FL330, when the crew reported an unruly passenger trying to gain access to the cockpit and requested law enforcement to be present for landing in Heathrow. The airplane descended to FL250 and flew across Ireland and the UK at that level accompanied by two Royal Air Force fighter jets and continued for a safe landing in Heathrow. The passenger was taken into custody by UK police.
American Airlines reported, that a female passenger became distressed during the flight and attempted to gain access to the cockpit. The passenger was calmed by cabin crew, the flight crew requested a priority landing as a precaution. The airplane was met by police upon arrival.