Germany has grounded air traffic across its northern airspace because of ash from an erupting volcano in Iceland.
Bremen airport was closing at 0300 GMT and Hamburg at 0400 GMT, Germany's weather service said.
The airspace over Berlin and Hanover could also be affected.
Air traffic in Norway and Denmark has been disrupted but flights were expected to resume across the UK after some airspace in the north was closed.
However air traffic is returning to normal in other parts of northern Europe, a day after about 500 flights were cancelled across the region.
On Tuesday, dozens of planes were grounded at UK airports including Glasgow, Edinburgh, Newcastle, Barra, Prestwick, Cumbernauld, Londonderry, Tiree, Carlisle and Durham Tees Valley.
Airports say they are hoping to resume normal services but have warned of possible delays and passengers are advised to check with their airline before travelling.
Tuesday's cancellations came just over a year after another volcanic eruption in Iceland caused widespread disruption across Europe, including the closure of UK airspace, amid concerns about the damage volcanic ash could cause to engine aircraft.
The Grimsvotn volcano in Vatnajokull National Park began erupting on Saturday and closed Iceland's airspace for a period.
Experts say the eruption is on a different scale to the one last year and is producing larger ash particles, which fall to the ground more quickly.
Icelandic government adviser Professor Magnus Tumi Gudmundsson said the eruption from the volcano was slowing down "day by day" and he believed the worst was over.
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This magical museum is housed in the 17th century Convento das Bernadas and showcase all sorts of puppets the world over. There are familiar favourites like Punch and Petrushka but there are also Vietnamese water puppets, Sicilian opera marionettes and Burmese shadow puppets. The museum also offers workshops where children can try their hand at puppetry. Address: Rua da Esperanca 146 Tel: +21...
This was built in 1838 and its original purpose was to stand as the Royal Palace, home to the monarch. The most unique feature of this building is the change in its color throughout the day; from white to gold to mauve. Don't miss the changing of the Guard at the Tomb of the Unknown Soldier which takes place daily. Address: Vasilissis Amalias, Syntagma Square ...
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