Dublin Airport is facing a second day of disruption at Terminal 2 after a cyber-attack knocked out a check-in and baggage system.

The airport said it was continuing to support airlines dealing with the “Europe-wide technical issue”.

It is understood that IT experts from the US are due to fly into Dublin on Sunday evening to check the systems.

A Dublin Airport spokesperson said that as of midday, 13 flights had been cancelled – nine inbound and four outbound.

Aer Lingus said it would be “significantly impacted” on Sunday, leading to flight delays and cancellations.

The airline also advised customers to check-in for flights online in advance and said updates would be provided.

Graeme McQueen, spokesperson for Dublin Airport, said they were continuing to support airlines dealing with “ongoing disruption caused by a Europe-wide technical issue that is impacting on their check-in and boarding systems”.

He added some airlines were continuing manual workarounds to generate bag tags and boarding passes with processes taking longer.

“Passengers should plan to arrive at the airport as normal today (two hours before a short haul flight and three hours before a long haul flight), however, those needing to check-in or drop off bags at the airport should allow additional time.

“If you are flying over the next 12, 24, 48 hours, keep an eye on your airline’s updates, they will have the latest updates on the status of your flight.”

RTX, which owns software provider Collins Aerospace, said it was “aware of a cyber-related disruption” to its system in “select airports” and that it hoped to resolve the issue as quickly as possible.

It identified its Muse software – which allows different airlines to use the same check-in desks and boarding gates at an airport, rather than requiring their own – as the system that had been affected.

The company has yet to disclose what went wrong or how long it expects the outage to last.

On Saturday, Terminal 2 was evacuated following a security alert but was later given the “all-clear”.

The evacuation was a “precautionary measure” after police were alerted to a suspicious item of airline luggage at about 11:30 local time (11:30 BST).

Gardaí (Irish police) were assisted by the Irish army’s explosive disposal team.