A second transatlantic flight has been forced to divert to Shannon Airport this afternoon after the crew declared a medical emergency.
Air Canada flight AC-849 was en route from London to Toronto and was about 400kms north west of Ireland when the crew turned around.
The Boeing 777 jet rerouted to Shannon where airport fire crews and National Ambulance Service paramedics were standing by.
The flight landed at 5.15pm and was met at the terminal by airport authorities and medics. The passenger was removed by ambulance to University Hospital Limerick for treatment.
Earlier, Austrian Airlines flight OS-93 made an unscheduled landing at the mid-west airport after the crew declared an emergency just north of Mayo. The crew reported they had a man on board whom they believed to have suffered a heart attack.
The Boeing 767 jet landed safely at 12.30pm and was accompanied to the terminal by airport fire service vehicles.
Airport authorities and ambulance paramedics were waiting to board the aircraft. The passenger was assessed at the airport before being removed to hospital by ambulance.