Ryanair chief Michael O’Leary to discuss Brexit effect on aviation – Telegraph.co.uk
This could prevent a British airline running flights from, for example, Marseilles to Paris and reduce competition. While it would likely hit UK’s Easyjet, Ryanair would be unaffected as Ireland is an EU country.
Without an agreement in place, Britain would also no longer be a member of the EU-US Open Skies pact. The agreement allows US and EU aircraft to land on each other’s airports, meaning Britain would have to strike a separate deal with the Americans.