Aer Lingus has cancelled all flights out of Dublin Airport to the UK and Europe on Saturday afternoon due to IT issues.
Earlier this morning, thousands of passengers faced huge queues after the airline reported IT issues at around 9am.
Images began surfacing on social media showing hundreds of Aer Lingus passengers waiting to check in before heading off later.
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A spokesman for Aer Lingus said that due to a "major incident" with a network provider, the company's cloud-based systems enabling check-in, boarding and its website are currently unavailable.
He said: "Unfortunately, this is causing severe disruption to Aer Lingus services today. Consequently, all flights originally scheduled to depart from Dublin Airport for European and United Kingdom destinations from 2.00pm onwards today have had to be cancelled.
"As we are currently unable to communicate directly with customers, we are asking customers booked to travel on those flights not to come to Dublin Airport .
"We sincerely apologise to all customers impacted by today’s disruption and cancellations," he added.
Aer Lingus is advising that customers impacted by today’s disruptions will be able to change their travel plans, free of charge either through its call centre or social media channels.
"We will advise customers when IT systems are restored and this change option is fully available to our customers.
" As soon as systems are restored our teams will work to re-accommodate those impacted as efficiently as possible, and share information regarding customers’ rights and the airlines’ obligations under Regulation (EC) 261/2004.
"We are working intensively with our system partners and their network partners to resolve the connection issues as soon as possible."
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