I am holder of an UK-issued ATPL. Can I operate an aircraft of a commercial operator certified by an EASA Member State after December 31, 2020?
As of January 01, 2021, licenses and certificates issued by the UK are no longer valid in EASA Member States and are treated as a third-country licences and certificates. Accordingly, as of that date, a UK-issued ATPL cannot be used to operate aircraft of commercial operators under oversight of EASA Member States.
As of January 01, 2021, in order to obtain a Part-FCL licence from an EASA Member State, UK licence holders must follow a conversion process as per Commission Delegated Regulation (EU) 2020/723.