Aer Lingus has said its flights from Dublin, Cork and Belfast to and from Heathrow have been severely disrupted because of an emergency landing by a plane at the London airport.
The disruption is likely to continue into tomorrow.
An official investigation has begun into today's emergency landing, which happened shortly before 1pm.
Eighteen people were treated in hospital after the British Airways Boeing 777, en route from Beijing, crash landed in a field, hundreds of metres short of the runway.
All 136 passengers and 16 crew escaped down emergency chutes after the airliner skidded over the grass and came to a halt.
One report said the plane lost power on its approach to land.
Part of Heathrow Airport is closed to flights as a result of the incident.
The incident delayed British Prime Minister Gordon Brown who was aboard a plane at Heathrow. He was due to leave for China and India.
An Aer Lingus flight from Cork to Heathrow was diverted this afternoon to London Gatwick and another flight from Heathrow to Cork was cancelled.
All other flights to and from Dublin, Belfast and Cork are experiencing delays.
The Dublin Airport Authority is advising passengers travelling to Heathrow to contact either Air Lingus or British Midland to see if their flights have been affected.
BA is posting updated information on its website www.ba.com a helpline for customers has also been set up at 00-44-191-211-3690.
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