Ryanair UK is a subsidiary of low-cost carrier group, Ryanair Holdings. Ryanair introduced Ryanair UK as a protective measure following the announcement that the UK will withdraw from the European Union. The carrier confirmed UK's Civil Aviation Authority issued Ryanair UK with an air operator's certificate (AOC). The AOC will allow Ryanair to operate UK domestic routes and UK to non EU routes in the post-Brexit environment. Ryanair UK launched service operations on 12-Mar-2019.