The States of Guernsey is working with Irish and British authorities to secure a long-term permit. Aurigny said it hopes to find a solution to the problem before operating services to Belfast becomes necessary.
Customers with bookings between 12 and 30 April have been advised by email that their route to Dublin will be via Belfast.
Pictured: Aurigny has been operating direct flights to Dublin since 16 March.
The airline said the situation was “highly unusual and totally unexpected”. It said it had applied for and received permits to operate several flights to and from Ireland since Brexit and believed the permit for the new service to Dublin to be a formality.
“An application was made to start this same service in the summer of 2021 and it was approved, so we had no reason to expect it would be any different in 2022,” it said.
“Aurigny apologises for any inconvenience caused to its customers and continues to work towards a solution and successful services linking the island to Ireland.”