Further disruptions to flights are possible over the coming days following a power outage at Heathrow, Dublin Airport has warned.
More than 1,000 flights to and from the major London airport have been cancelled, with hundreds of thousands of passengers affected in the disruption linked to a fire at a nearby electrical substation.
These include 34 flights to and from Dublin Airport, 14 at Belfast City Airport and six at City of Derry Airport.
Shannon Airport has facilitated six diverted flights which had originally been scheduled to land at Heathrow, involving flights from Toronto, Atlanta, Bridgetown Barbados, Boston, Orlando and Newark.
Dublin Airport said in a statement that further disruption to flights between Dublin Airport and Heathrow over the coming days is possible.
Watch: Hen parties and holidaymakers at Dublin Airport affected by Heathrow issues
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"We continue to monitor developments at Heathrow and remain in close consultation with affected airlines regarding when flights between Dublin Airport and Heathrow may recommence," it said
Airlines, including Aer Lingus and British Airways, have been trying to get as many passengers as possible re-routed to other airports in the UK following the disruption.
Passengers had been turning up to Dublin Airport to learn that their flights to Heathrow were cancelled.
Many of those at Terminal 1 were bound for the United States via Heathrow.
Several passengers told RTÉ News they were hoping to get to their destinations despite the disruption.
One woman who is travelling to a wedding in New York said she had been put on an alternative flight.
A group of students travelling from Argentina to London said they did not expect this delay after their long flight.
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Around 5,500 Aer Lingus passengers impacted
The Chief Corporate Affairs Officer with Aer Lingus has said that in total 38 flights on routes between Ireland and Heathrow Airport were cancelled, with approximately 5,500 passengers impacted.
Donal Moriarty said that the operations team are in close contact with Heathrow and will resume schedule as soon as possible.
Speaking on RTÉ's News at One he said Aer Lingus was hopeful that services will operate tomorrow but there may be some knock on effects that will need to be worked through.
He added that all will become clearer later today through consultation but that the company will comply with all disruption obligations.
People with confirmed bookings over the weekend via Heathrow Airport will "have priority over anybody who is cancelled today", the Vice President of the Irish Travel Agents Association said.
Paul Hackett said there "will be knock on effects" over the disruption at the facility, adding that airlines will be "looking to use any capacity possible to facilitate people" that have been impacted by cancellations.
Watch: Passengers at Shannon Airport reacting to Heathrow disruption
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Mr Hackett said aircraft and crew are "in the wrong position" due to issues at the airport, adding "this will take some time to work through".
For those travelling onwards from Heathrow Airport, Mr Hackett said: "The outbound flight from Heathrow to their destination will be cancelled, so there is no point in them leaving Ireland until there is a full re-routing or re-booking of that flight for them."
