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Some flights are taking off in Scotland, where airports have reopened, although there are fears of a new volcanic ash cloud spreading to the UK.The first flight from Glasgow headed for Stornaway just after 0715 BST and a flight from Aberdeen to Newcastle is set to depart at 0825 BST.
Nats said the new ash cloud is causing uncertainty and there was now a worsening situation in some areas.
Belfast Airport only expected flights to the Isle of Man during the morning.
The first international flight from Glasgow is expected to depart at midday going to Reykjavik, in Iceland.
Changing conditions
Flights from Newcastle are expected to head to Aberdeen and the Isle of Man.
Nats said it would report again at 0900 BST.
It said more airspace over England was expected to become available from 1300 BST although not as far south as London's main airports.
In a statement it said: "The volcano eruption in Iceland has strengthened and a new ash cloud is spreading south and east towards the UK.
"This demonstrates the dynamic and rapidly changing conditions in which we are working."
British Airways has cancelled all short-haul flights on Tuesday but said it hoped to run long-haul flights scheduled to depart after 1600 BST depending on a "full and permanent" opening of airspace.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.