Flights in and out of Scotland have been cancelled as a volcanic ash cloud from Iceland heads towards the UK.
BA, KLM, Easyjet, Flybe, Aer Lingus, Loganair and Eastern Airways have cancelled services on Tuesday, and some flights over the Atlantic were delayed.
The threat of further disruption led US President Barack Obama to fly out of the Republic of Ireland a day early to get to London for a state visit.
Ash from another Icelandic volcano led to huge disruption in Europe last year.
Air Force One
Mr Obama had been due to fly to the UK on Tuesday morning, but White House deputy press secretary Josh Earnest said the decision to bring his arrival forward had been taken "due to a recent change in the trajectory in the plume of volcanic ash".
The Met Office forecasts the ash cloud will reach northern and western Scotland overnight, and will clip northern parts of Northern Ireland early on Tuesday. None of England is likely to be affected.
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