Iceland's Eyjafjallajokul volcano is threatening UK airspace once again as a fresh ash cloud moves towards Western Europe.
The Department of Transport has warned that some of the South-East's busiest airports will face disruption. British Airways are holding a top brass meeting at 3.30 this evening to asess the situation.
Distruption to BA services is already likely as cabin staff and crew begin a 20 day strike this Tuesday. Parties are due to meet at conciliation service Acas.
New Transport Secretary Philip Hammond said "safety is our highest priority".
The volcano has continued to erupt since the inital explosion in early April and has recently disrupted flights in Spain. The wind, which was sending the ash west, has now apparently changed direction.
The National Air Traffic Service says it is waiting for guidance from the Met Office.
In other developments a new five day ash prediction chart will be published on the Met's website replacing the 18 hour forcast. However, the Office warns that the new data will be based on "assumptions".
Just weeks ago the Conservative party was attacking the Labour Transport minister over the six day shut down of UK airspace that left tens of thousands stranded and cost the aviation industry millions..
MPs and flight company officials have called for a probe into what they say was a lack of response.