Airspace over some parts of Scotland and Northern Ireland have closed for 12 hours due to the volcanic ash cloud from Iceland.
The Civil Aviation Authority (CAA) said the ash over UK airspace has “increased in density” and was above the levels considered safe by manufacturers for aircraft engines.
In Scotland, Glasgow, Prestwick, Inverness, Stornoway, Benbecula, Tiree, Islay, Barra and Campbeltown airports will be closed until 7pm today.
Derry airport, Belfast City and Belfast International in Northern Ireland will also remain closed until 7pm.
Dublin Airport will also close from 11am until further notice. The Irish Aviation Authority said Donegal, Sligo and Ireland West would be restricted from 11am.
Forecasts show the 60 nautical mile buffer zone imposed around high concentrations of ash is close to some northern airports.
The CAA advised customers travelling from Edinburgh, Carlisle, Blackpool, Liverpool and Manchester to check before travelling to the airport, as the ash could affect those airports later in the day.
In a statement, the CAA said: “The situation remains changeable, so passengers expecting to travel from airports in Scotland, Northern Ireland, the North of England and north Wales should contact their airlines to check whether their flight is operating.”
The news follows a six hour closure yesterday as flights were cancelled in Ireland and some parts of Scotland.