A defect in the main runway at Alderney Airport means it has closed to commercial flights, the States of Guernsey has said.
The States, which is responsible for the airport, said a defect was found during a routine inspection on Tuesday.
It said the surface had subsided due to a “failure in the base material”.
Airline Aurigny said all flights to and from Alderney had been cancelled and it was working with Guernsey Ports to find “alternative travel options”.
The government said work was “likely to begin” on Wednesday afternoon, so the airport could reopen by Thursday lunchtime.