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Most flights to and from Northern Ireland have been cancelled for a third day due to the threat posed to planes by the volcanic ash cloud from Iceland. Restrictions had been lifted in Scotland and Northern Ireland on Friday evening but were reapplied overnight.
Air traffic control body Nats said some domestic flights may be able to take off from Northern Ireland and Scotland if the cloud "moves sufficiently".
"It is most unlikely that many flights will operate today," it added.
"Anyone hoping to travel should contact their airline before travelling to the airport."
BBC weather forecasterNats said the ash cloud was "moving around and changing shape". A further update is expected at about 1500 BST.
Belfast City Airport has cancelled all its flights apart from the ones travelling to and from the Isle of Man.
Restrictions on UK airspace due to the threat posed to planes by the volcanic ash cloud from Iceland have been extended until 0100 BST on Sunday.
Airspace in the Irish Republic remains closed until at least 1800 BST on Saturday, and no flights will take off or land at Dublin Airport during that time.
Hundreds of thousands of passengers have been stranded in the UK and abroad by flight cancellations.
Restrictions on flights in the UK have been in place since 1200 BST on Thursday because of fears particles in the ash from the volcanic eruption in Iceland could shut down plane engines. Air travel across Europe has been severely affected, with a range of countries from Belgium to Switzerland completely closing their airspace, while others like Austria, Germany and Poland have enforced partial closures.
BBC weather forecaster Nick Miller said: "As the weekend goes on there is a risk that prevailing winds will keep volcanic ash in the air above parts of the UK, and may even bring it back to those parts from which it has cleared."
Experts say the tiny particles of rock, glass and sand contained in the ash cloud could jam aircraft engines, as has happened in previous incidents of planes flying into plumes of volcanic ash.
The last eruption of the Eyjafjallajoekull volcano system that is creating the problems was on 20 March, when a 0.5km-long fissure opened up on the eastern side of the glacier at the Fimmvoerduhals Pass.
The eruption prior to that started in 1821 and continued intermittently for more than a year.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.