Aer Lingus (United Kingdom) (EG, Belfast City) added its first A330-300 transferred from parent company Aer Lingus (EI, Dublin International) on July 5, 2021.

G-EILA (msn 1106), previously EI-ELA on the Irish register, has remained parked at Dublin International airport since February 22, 2021. The aircraft is owned by AerCap and has been operated by the Irish carrier since initial delivery from Airbus in 2010. It seats up to 317 passengers, including 30 in business class and 287 in economy.

The British subsidiary of Aer Lingus is set to add another A330-300, as well as one A321-200NX(LR). It intends to begin revenue operations out of Manchester International on July 29, 2021, deploying the A321 to New York JFK and the A330 to Orlando International. Flights will operate under the "EI" code of Aer Lingus. The UK carrier will remain a technical capacity provider established to comply with the US-UK bilateral air services agreement.

Aer Lingus (UK) has yet to receive an air operator's certificate (AOC) or operator's licence (OL) from the UK Civil Aviation Authority.