Aer Lingus UK
Aer Lingus UK was founded on 25 May 2012 with its headquarters in Belfast, Northern Ireland, as a United Kingdom-based company.[7] In December 2020, the airline applied with the United States Department of Transportation (USDOT) for a foreign air carrier permit,[7] which was approved in March 2021.[14] On 25 August 2021, the airline's services to the United States were again postponed to December 2021 as a result of the continued delay of UK-US border restrictions being lifted.[17] In September 2022, Aer Lingus UK was the first airline to operate a flight into the then new Terminal C at Orlando International Airport.[18] In October 2022, it was announced that Aer Lingus' operations between Belfast City and London Heathrow would transfer to Aer Lingus UK due to Brexit related requirements that a European Union carrier could no longer fly domestic routes within the United Kingdom.