Ash from a volcano erupting in Iceland has been affecting air traffic in Britain, causing disruption for thousands of passengers.
Several airlines have cancelled air services in and out of Scotland and some flights over the Atlantic have been delayed.
The Grimsvotn volcano is Iceland's most active and began erupting late on Saturday.
Airports likely to be affected on Tuesday include Londonderry, Glasgow, Edinburgh, Prestwick, Durham Tees Valley, Newcastle and Carlisle, the BBC reports.
European air traffic controllers say 252 flights had been cancelled so far.
British Transport Secretary Philip Hammond said although there would be widespread disruption for Scottish airports, it was unlikely to last long.
He told the BBC he expected Edinburgh and Glasgow airports to be clear by afternoon on Tuesday, and northern Scottish airports by Wednesday morning.
The Volcanic Ash Advisory Centre in London said there is a strong possibility that the ash cloud may affect parts of Denmark and southern Scandinavia on Tuesday.
Iceland's main airport reopened late on Monday.
In April last year, the Eyjafjallajokull volcano erupted in Iceland, shutting down large swathes of European airspace amid fears the volcanic ash could wreak havoc on aircraft engines.
An estimated 10 million passengers were affected when all planes were grounded in northern Europe for six days.
