Ryanair UK confirmed it applied for an AOC from the UK CAA (Reuters/BBC News, 02-Jan-2018). Ryanair stated: "A subsidiary company Ryanair UK filed an application on 21-Dec last for an Air Operator's Certificate (AOC) with the Civil Aviation Authority in the UK. This may be required for Ryanair's three UK domestic routes in the event of a hard Brexit in Mar-2019".
Ryanair UK applies for UK AOC
3 January, 2018