Worrying images have emerged that shows a packed flight with passengers seated so close to each other social distancing concerns were raised.
Aer Lingus said it will review its procedures after pictures inside the cabin of a Belfast to London Heathrow flight on Monday morning were shared on social media.
The images shows the passengers sitting in regular seats side by side which goes against coronavirus guidelines that advise people to be seated at least two metres apart.
Passenger Sean Mallon, who was travelling to England for work, told BBC Radio Ulster there was ‘no social distancing whatsoever’.
He said: "I would say there was about 95% of the seats taken on the flight."
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He claimed neither the cabin crew or other airline staff offered any guidance to passengers on social distancing so they were allowed to sit in their seats as they would have before the Covid-19 pandemic.
Mr Mallon also added travellers queued and boarded the plane without social distancing and they weren't offered any hand sanitiser but were advised to wash their hands after landing.
He added: "The queues were down the steps and out on to the tarmac as they were before all this happened."
At the moment there are just two London services operating from Belfast City and City of Derry airports by Aer Lingus and Logan Air.
Many Irish construction workers use the flights to travel to London for work.
Aer Lingus released a statement saying changes that are needed will be done as a "matter of urgency".
The statement reads: "In light of the unexpectedly high loads on the Belfast-London Heathrow service this morning and the level of demand for the route, Aer Lingus is reviewing its processes and procedures applicable to the operation of this service.
"The safety and security of Aer Lingus’s customers and crew is our top priority and any process changes that are identified as being required will be implemented as a matter of urgency."
The pictures have emerged as the boss of Heathrow Airport has warned that post-lockdown social distancing queues won't work because they would need to be a kilometre long.
John Holland-Kaye has called on Prime Minister Boris Johnson to "take a lead" in agreeing a common international standard for health in air travel to "save jobs".
He wrote in a Daily Telegraph column: “Forget social distancing – it won’t work in aviation or any other form of public transport, and the problem is not the plane, it is the lack of space in the airport.
"Just one jumbo jet would require a queue a kilometre long."
The CEO said while social distancing at airports is completely impractical, a "package of measures" similar to Asia since the Sars crisis needs to be in place by the summer.
Mr Holland-Kaye said such an easily manageable attitude to safety is "practical, medically proven and builds confidence".
He suggested a health check on entering the terminal, with passengers who are displaying high temperatures receiving further checks to ensure they can fly.
He added that surgical face masks "may become the norm", while contact between passengers and airport staff would need to be lessened and "fantastic levels of hygiene" maintained.
