|Airlines have cancelled many flights, although experts expected no repeat of last year's travel chaos [Reuters]
The German airline, Lufthansa, expects to cancel about 150 flights on Wednesday due to ash pouring out
of an Icelandic volcano.
Airports in the northern ports of Bremen and Hamburg were closed on Wednesday "and will probably reopen only in the afternoon."
On Tuesday, German air safety experts said they would shut down airports in northern Germany from from 5:00 am (0300 GMT) owing to the threat ash is said to pose to airplane engines.
Airlines grounded about 500 flights on Tuesday after ash from an Icelandic volcano swept over Britain and towards northern Europe in a fresh travel nightmare for thousands of passengers.
Below is a list of flights cancelled or delayed by the eruption affecting parts of Britain and the Nordic countries.
United Kingdom: More than 370 flights were cancelled on Tuesday.
British Airways cancelled 92 flights, including all flights to and from Scotland's two largest cities, Glasgow and Edinburgh; six flights to and from Aberdeen; six to and from the northeastern English city of Newcastle.
EasyJet had 113 cancellations of flights in and out of Scotland, Newcastle and Northern Ireland.
Ryanair cancelled all 68 flights in and out of Scotland.
Flybe: 54 flights cancelled to and from Scottish cities of Aberdeen, Glasgow, Edinburgh, Inverness, and
BMI Baby cancelled four flights to and from Glasgow and Edinburgh.
KLM cancelled 42 flights, including 29 to and from Scotland; eight to and from Newcastle; three to and from Stavanger, Norway; and one each from Durham in England and Kristiansand, Norway.
Aer Lingus cancelled 22 flights to three Scottish airports.
Iceland: Occasional flights to and from London and Manchester have been cancelled.
Greenland: Air Greenland cancelled two daily flights between Greenland and Copenhagen after Greenland airspace was partly closed.
Air Iceland cancelled flights to and from three destinations in Greenland.
Sweden: Ten flights cancelled on Tuesday evening after officials warn of approaching ash cloud.
Norway: Two daily flights between the mainland and the Arctic islands of Svalbard cancelled until further notice. Occasional flights to and from Iceland and Stavanger in western Norway have also been cancelled
Trans-Atlantic: Nordic airline operator SAS AB says trans-Atlantic flights in and out of Scandinavia will take one hour longer than normal as routes are changed to avoid the ash cloud. BA says flights will be delayed by half an hour.