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Airlines around the
world began to confront a huge backlog of passengers on Wednesday,
after six days of European airspace restrictions had forced the
cancellation of more than 100,000 flights and cost the airline industry
an estimated $1.7 billion.

While officials
said it could take weeks for some travel to return completely to
normal, some airlines in Europe and Asia said they were moving rapidly
to restore flights. Eurocontrol, the agency that coordinates regional
air-traffic management, said three-quarters of the 28,000 flights
scheduled for European airspace were expected to fly on Wednesday – the
highest proportion in days.

About two-thirds of
scheduled departures and half of arriving flights were operating at
Heathrow Airport outside of London. At Frankfurt International Airport,
about half as many flights as normal were taking off and landing.

A spokeswoman said
that airlines had added 90 supplementary flights in and out of Heathrow
since Britain reopened its airspace late Tuesday, becoming the last
major European country to do so after a huge plume of volcanic ash
spreading south and east from Iceland disrupted travel over much of the
continent.

But flights were
not resuming as quickly at other British regional airports. Only 10 per
cent of scheduled flights at Edinburgh operated on Wednesday morning, a
figure that was expected to rise to 50 per cent by the evening. In
Aberdeen, only 30 per cent of morning flights operated, while 65 per
cent were expected from 5pm.

The International
Air Transport Association (IATA), said Wednesday that the crisis had
cost airlines more than $1.7 billion in lost revenue through Tuesday.
At its worst, the association said, “the crisis impacted 29 per cent of
global aviation and affected 1.2 million passengers a day.” Before
restrictions were eased, the chaos had lasted twice as long as the
three-day closing of American airspace after the attacks of September
11, 2001, which devastated many airlines financially. By midday in
Paris, Air France said that it had been able to restore almost all
service across its entire network, and had flown more than 40,000
stranded passengers back to France since Monday.

The airline said it
expected to operate all its scheduled long-haul flights on Wednesday
and many European flights except for those to northern and northeastern
Europe, where some airports remained closed.

Aéroports de Paris,
which operates Charles de Gaulle and Orly airports, said all
intercontinental arrivals and departures and 75 per cent of European
and domestic flights were expected to operate Wednesday.

British Airways
planned to operate all of its intercontinental services from London’s
Heathrow and Gatwick airports on Wednesday, although many of its
domestic and European flights remained cancelled until at least
Wednesday afternoon.

Britain’s National
Air Traffic Service said it had handled roughly 130 flights in the
airspace over England and Wales between 1am and 7am on Wednesday and 35
flights in Scotland and Northern Ireland. British airspace would be
largely open on Wednesday, except for parts of Scotland with a “dense
concentration” of volcanic ash. Aer Lingus, the Irish flag carrier,
said it expected to resume a full flight schedule by early afternoon.

With their call
centres jammed by customers trying to re-book their flights, some
airlines found innovative ways to speed the process, including social
media networks.

The Dutch carrier KLM advised passengers on its Web site that re-booking could be done via Twitter or on its Facebook page.

According to
forecasts by Britain’s Met Office meteorological agency and the
Volcanic Ash Advisory Centre in London, winds were expected to continue
blowing the highest concentrations of ash westward toward the northeast
coast of Canada. By midnight Wednesday, the cloud was expected to be
largely clear of Europe, lingering over only Ireland and parts of
northern Scotland.

The New York Times