Rather like rival Ryanair, Aer Lingus has now registered a UK offshoot with initially a single aircraft on the British register. 

This new British subsidiary of the Irish flag carrier is set to open up Manchester International as a long-haul base with services to New York JFK, Orlando and Barbados, using Airbus A-330 and A321 LR aircraft.   An Air Operator Certificate (AOC) has been applied for.  It is a requirement of the US Department of Transportation.

These will operate under the EI code under a codeshare agreement with British Airways, a fellow member of International Airlines Group (IAG) with the US destinations operating from 30 September and Barbados 20 October.

Manchester has been a key Aer Lingus airport over many decades.  Ireland has become the first country in Europe where fully vaccinated British citizens can visit without the need for any Covid-19 tests into or out of the country. There is no requirement to self-isolate if fully vaccinated.  At present Aer Lingus is operating 109 weekly scheduled services between the Republic of Ireland and the UK.
 
www.aerlingus.com