An off-duty pilot assisted an emergency landing of a Lufthansa flight in Dublin Airport on Monday morning.
The pilot was identified through the passengers' list after the co-pilot fell ill while halfway through the flight from Newark to Frankfurt. The aircraft landed safely at Dublin Airport at 5.40am.
The Boeing 747 flight was in Oceanic airspace when it made its request to Shanwick Air Traffic Control to divert to Dublin.
Shannon Air Traffic Control was informed of the diversion by Shanwick.
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A spokeswoman for Lufthansa said that even if the off-duty pilot had not been on board, the captain would have had control of the aircraft.
The Air Accident Investigation Unit has begun an inquiry into the incident.