Flights from Stansted Airport in Essex are being disrupted for a second day because of a volcanic ash cloud over Scotland and Ireland.
Airport officials are advising passengers to contact their airlines for flight details before setting out.
Airports in Scotland, Northern Ireland and the Republic of Ireland have suspended flights.
Flights between Stansted and Dublin, Belfast, Derry, Shannon and Glasgow are cancelled.
Passengers due to travel are advised not to go to the airport, but to change their flight bookings or request refunds.
Flights to Inverness and Edinburgh have resumed.
Flights to and from Aberdeen are planned to operate normally.
The Civil Aviation Authority said all other airfields currently within the no-fly zone will remain within it from 1900 to 0100 on Thursday.