Restrictions on travel between the US and Europe could be eased as soon as next month with the Labour Day weekend early in September regarded as the most likely date.

Aer Lingus resumed flying on the Dublin to Washington route last week bringing to four the number of US cities the airline is currently flying to.

It compares to 15 cities in North America that the IAG owned airline was servicing pre-pandemic.

Despite mounting pressure from airline industry bodies such as IATA, US borders remain closed to Europeans.

Currently, only US citizens and residents can travel from Europe, the UK and Ireland to the US.

"It [the easing of restrictions] will probably happen around Labour Day, around September 6th," Eoghan Corry, Editor of Air & Travel told Morning Ireland.

"There will likely be a raft of airline sales as soon as they get clearance to try stimulate traffic on those routes," he said.

Competition on transatlantic routes is already heating up.

Low cost carrier JetBlue has started offering services between New York JFK and London Heathrow - regarded as the world's most lucrative air route.

It plans to expand its transatlantic route offering in the months and years ahead.

Aer Lingus was also recently given clearance to start services to North America from Manchester from next month.

"Aer Lingus is in a good position with unit costs much lower than competitors on transatlantic routes," Eoghan Corry said.

"They will have a code share with JetBlue as well. They're grouping themselves with a 'never been cheaper to cross the Atlantic' kind of message. It will be interesting to see how that plays in the Autumn," he added.