IRISH airline Aer Lingus has been forced to cancel several flights to Heathrow and from Heathrow today.
The airline confirmed that staff shortages were behind the cancellations.
Three trips to London were scheduled to take off at 7.30am, 3.55pm and 8.15pm, but have been cancelled.
Inbound flights from Heathrow have also been grounded, due to set off at 11.20am and 7.35pm.
Two other journeys from Dublin to Hamburg (7am) and Berlin (5.55pm) have been cancelled as well.
Arrivals from both Hamburg, set to fly at 11.50am and Berlin, departing at 11.15pm will also no longer operate.
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It's not the first time this week Aer Lingus have cancelled flights, with trips to Lyon, Geneva, Munich, Amsterdam, Frankfurt and Edinburgh all called off on Wednesday.
A spokesperson for the airline told Sun Online that a spike in Covid cases had made "system pressures" and "ongoing issues" at airports worse.
However, they explained that just over one per cent of their flights had been impacted this month.
They said: "Due to a spike in Covid cases, Aer Lingus has been forced to cancel five return flights and one direct flight today, June 30; and three return flights and one direct flight tomorrow, July 1.
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"Due to a mandate from London Heathrow Airport Authority, one return flight to Dublin Heathrow today, June 30 has also been cancelled. Just over one per cent of Aer Lingus flights have been impacted by cancellations in June.
"Aer Lingus wishes to apologise to those impacted and teams at the airline are working to re-accommodate impacted passengers on the next available services as efficiently as possible. Aer Lingus anticipated the return of demand for travel once Covid restrictions were removed and built appropriate buffers into our plans in order to deal with a reasonable level of additional disruption."
Aer Lingus are not the only airline whose Heathrow flights are currently affected.
The London airport told 30 airlines that they had to cancel flights during the morning peak, affecting 5,000 passengers
While Heathrow hasn't confirmed which airlines have been affected the most, British Airways said a "handful" of their flights have been affected.
Virgin Atlantic also said two of their flights had been affected, while Delta, Lufthansa , KLM, American Airlines and Air France are among the other airlines with cancelled routes.
Fuming Brits complained on social media calling it "carnage" and "total chaos" – one man wrote: "Absolute shambles, complete chaos & only found out at check in with no prior notification."
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This week's cancellations come just days after Heathrow descended into chaos with suitcases abandoned across terminals.
Other airports have had to reduce their schedule too, with Gatwick cancelling 4,000 flights in advance this summer.
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