Fewer than half of Europe's regularly scheduled commercial flights were expected to take place Friday and many of the region's busiest routes will remain closed at least into Saturday as the fallout from a volcanic eruption in Iceland stranded thousands of travelers and started to impact global trade.

Airlines across the world were affected, with Eurocontrol, a 38-country agency in Brussels that coordinates European flights, estimating only 11,000 flights will take place Friday in European airspace compared with 28,000 flights on an average day. Fridays are busy days for travel as business passengers return home, while leisure passengers depart for holidays.

Only 20,334 flights occurred Thursday, Eurocontrol said. About 100 Trans-Atlantic flights arrived in Europe of the 300 typically expected.

The Air Transport Association, or IATA, which represents some 230 airlines and 93% of scheduled international global air traffic said that at current levels of disruptions, its initial and conservative estimate of the financial impact on airlines is in excess of $200 million per day in lost revenues. However, it said airlines would be hurt further as it they will incur added costs for re-routing of aircraft, care for stranded passengers and aircraft at various ports.

A volcano under Iceland's Eyjafjallajokull glacier erupted Wednesday for the second time in a month, spewing clouds up to 35,000 feet into the air. Aircraft travel at altitudes up to 35,000 feet.

Air-traffic problems Friday shifted as the ash clouds were blown across Europe. While limited airspace was reopened in Scotland, Ireland and Sweden, air-traffic controllers began to close down airspace in southern Germany, the Czech Republic, Bulgaria and Switzerland. Eurocontrol said latest weather forecasts predicted the cloud would move slightly south and east in coming days.

The latest update from the U.K.'s National Air Traffic Control Service said it would restrict flying until 0600 GMT Saturday "at the earliest" over England and Wales, extending an existing ban that had spread across Europe as the volcano's ash cloud drifted south. However, a ban on commercial flights will be lifted at 1800 GMT for a large part of Scottish airspace, which could allow the first flights between the U.S. and U.K. since Thursday morning.

Continental Airlines Inc. (CAL), which had canceled its Friday morning flights to Europe from the U.S, is expected to restart some overnight flights to Scotland that arrive Saturday.

Many of Europe's busiest passenger and cargo aircraft faced a second day of closure, though the weekend will give operators an opportunity to reposition aircraft and staff if the flying ban is lifted. NATS plans another update at 1930 GMT, with its findings determining flight plans by airlines across the world.

German aviation security agency DFS Deutsche Flugsicherung GmbH said Friday it expects large parts of the country's airspace to remain closed at least until Saturday 0600 GMT due to the spread of volcanic ash in the atmosphere. DFS spokesman Axel Raab said German airspace could even remain closed after Saturday morning. Germany's main hub airport in Frankfurt was closed.

Ashley Steel, who heads transport and infrastructure at KPMG, said the longer the disruptions continue, the harder it will be to clear the backlog of passengers on any spare capacity that may have existed on flights.

"Airlines will incur their biggest losses in the Trans-Atlantic business passenger category; the impact on economy class revenues is likely to be diluted because people will change their bookings and eventually still fly. However, the bottom line is, for an airline like British Airways PLC (BAY.LN) every day of their fleet being grounded is likely to cost tens of millions of pounds," Steel said.

She said some businesses such as car hire firms, ferries, trains and hotels would benefit. Eurostar said seats were still available on Saturday and Sunday but tickets for Friday sold out Thursday evening.

Airlines were starting to count the cost of the disruption Friday. Finnish airline Finnair said it had been forced to cancel 435 flights, affecting about 54,000 passengers, which was costing it about EUR2 million a day in lost revenue. Helsinki airport was set to be closed until at least Sunday at 1200 GMT. Belgian carrier Brussels Airlines expects the air travel disruption to cost it several hundreds of thousands euro. The cost to larger airlines like BA, Ryanair Holdings PLC (RYA.DB) or Deutsche Lufthansa AG (LHA.XE) is expected to be several millions of euros.

Volcanic ash is a significant safety threat to aircraft, and the cloud has spread across one of the busiest travel and trade routes in the world, forcing the closure of many of the region's key gateways, from Norway south to Paris. Particles reduce visibility, damage aircraft windshields and can cause engines to shut down.

As well as hitting air passenger and cargo traffic, the disruption was threatening political events.

On Saturday and Sunday, more than 70 delegations of world leaders, including U.S. President Barack Obama, are due to visit Krakow, in southern Poland, to pay their last respects to late Polish President Lech Kaczynski, who died in a plane crash. Krakow airport was closed Friday.

White House officials said late Thursday Obama still is planning to fly to Poland for the funeral despite the ash cloud, but U.S. Air Force officials are monitoring the situation in Iceland.

Elsewhere, air space above the Netherlands, Denmark and Belgium remained closed and airports in northern Paris also remained shut, including the Paris airports. Moving south and east, Austria, Switzerland, Bulgaria, Czech Republic and Slovakia were also closing down their airspace.

Scores of flights from Asia and the Americas were canceled or delayed for a second day.

"In general, the situation is dynamic and subject to change," said NATS on its Web site. "We continue to work closely with airports, airlines, and the rest of Europe to understand and mitigate the implications of the volcanic eruption."

The Centre for Asia Pacific Aviation estimated that some 6 million passengers could be affected world-wide if the closures continue for up to three days.

The flight disruptions may also have grounded about half of the daily cargo volume between Asia and Europe, according to an Asia-based aviation analyst. About 7,000 tons of goods are flown daily on average from Asia to Europe and another 4,000 tons from Europe to Asia, the analyst estimated, involving mostly electronics, luxury items and perishable goods such as fruits, vegetables and meat.

Meanwhile, oil traders were mulling the potential impact on jet fuel prices and trade in Asia but the impact on fuel use would depend on how many days airspace around Europe remains restricted or closed, they said.

Experts say the Icelandic eruptions could continue on-and-off for months, potentially meaning continued delays and closures. An expedition team that returned from the volcano Thursday found that the eruption was still going strong, with a lot of ash being propelled into the sky.

-By Kaveri Niththyananthan, Dow Jones Newswires; 4420 7842 9299; kaveri.niththyananthan@dowjones.com and Doug Cameron, Dow Jones Newswires; (312) 750 4135; doug.cameron@dowjones.com

(Paul Sonne, Daniel Michaels, Mike Esterl, Costas Paris, Yoshio Takahashi, Wayne Ma and Marcin Sobczyk contributed to this article.)

 
 
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