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Gordon Brown is meeting ministers to discuss the impact of flight restrictions imposed after volcanic ash from Iceland drifted over the UK.Thousands of Britons are stranded and the prime minister will discuss what can be done to help, Downing St said.
UK flight restrictions will be in place until at least 0700 BST on Monday with forecasters warning the dust cloud may remain over the UK for several days.
The Tories said it was "hugely worrying" there was no end in sight.
Meanwhile, bodies representing European airports and airlines have called for flight restrictions to be reviewed.
Mr Brown met senior ministers, representatives from the Met Office and chief scientific adviser Professor John Beddington at Number 10 at 1700 BST.
A Downing Street spokesman said: "The prime minister has called a ministerial meeting today to discuss the ongoing situation resulting from the presence of volcanic ash in the atmosphere, and look at what more the government can do to mitigate its effects.
"The meeting will cover a number of issues, including the assistance being provided to those Britons who have been unable to travel home, and the implications for industry.
"They will also look at what more can be done on a European level."
Transport Secretary Lord Adonis, Chancellor Alistair Darling, Business Secretary Peter Mandelson, Foreign Secretary David Miliband and Cabinet Office minister Tessa Jowell will attend the meeting, as well as officials from the Department of Transport.
The Conservatives have released an eight-point plan they would like to see to tackle the situation.
It includes chartering ships to bring people home who are stranded in Europe and urging ferry and rail operators to retain their normal pricing structures.
Shadow transport secretary Theresa Villiers said: "With thousands of Britons stuck in airports overseas, it is hugely worrying that there is no end in sight for the flight ban."
Liberal Democrat transport spokesman Norman Baker said it needed to be "urgently assessed" how much longer British passengers faced being stranded for.
A British Airways Boeing 747 will carry out a test flight from Heathrow to Cardiff on Sunday evening, with five people on board including chief executive Willie Walsh.
Dutch airline KLM and German airline Lufthansa have carried out test flights in their countries' airspace to see if it is safe for planes to fly.
KLM said it had flown a plane through the cloud of volcanic ash without suffering any damage.
Air France said it had successfully carried out a test flight from Paris to Toulouse.
A BA spokesman said: "In line with action taken by other European airlines and, subject to approval by the relevant authorities, we are planning to operate a test flight later today."
ACI, representing European airports, and AEA, representing European airlines, said they were "questioning the proportionality of the flight restrictions currently imposed".
AEA Secretary General Ulrich Schulte-Strathaus said: "Verification flights undertaken by several of our airlines have revealed no irregularities at all."
Earlier, Brian Flynn, head of operations at Eurocontrol, the organisation in charge of air safety in Europe, denied aviation authorities were being over cautious.
On Monday, EU transport ministers will meet to consider whether flights could resume even if volcanic ash remained in the atmosphere.
Ryanair has cancelled all scheduled flights between the UK, Ireland, Denmark, Finland, Norway, Sweden, Belgium, Holland, France, Germany, Poland and the Baltic states until 1300 BST on Wednesday.
Easyjet has cancelled all its flights scheduled before 1300 BST on Monday in areas where airspace is closed, but a limited number are expected to operate in southern Europe.
Bmi said it was cancelling all its Heathrow flights until midnight on Monday.
Anyone concerned about the safety of a British national stranded abroad can call a Foreign Office helpline on 020 7008 0000, or visit its website at www.fco.gov.uk.
Stranded Britons should contact their local embassy, high commission or consulate.
The disruption has affected hundreds of thousands of travellers since Wednesday, when the Eyjafjallajoekull volcano in Iceland began erupting.
Planes were first grounded in the UK at midday on Thursday amid fears that particles in the ash cloud generated by the volcanic eruption could cause engines to shut down.
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