Hundreds of airline passengers bound for London have been forced to land in Ireland.
Six transatlantic flights on their way from the US to Heathrow were redirected to Shannon Airport because of the cold snap disruption.
Some were in UK airspace or on approach to London when they were ordered back over to Ireland.
Shannon Airport Authority confirmed arrangements are being made for stranded passengers on at least one of the flights to stay overnight.
The affected routes included Heathrow-bound services from Dallas, Miami, Houston, Washington, Denver and Atlanta.
The aircraft were a mixture of Boeing 747s and 777s.
Shannon spokesman Eugene Hogan said the flights were redirected from this morning.
One Shannon to Heathrow flight has also been cancelled while others are delayed.
Aer Lingus and Ryanair have also axed a number of flights from Ireland to London and Birmingham following the snowfall in the UK.
Flights from Cork and Belfast to Heathrow have also been affected.