British aviation authorities say the country's two major international airports reopened for limited flights on Monday. A no-fly zone was imposed earlier, due to a dense cloud of drifting volcanic ash.

It appears the haze is beginning to disperse. London's Heathrow and Gatwick airports are now operating with restrictions. Passengers have been warned to expect delays and cancelations.

Another of Europe's biggest hubs, Amsterdam's Schiphol Airport, was scheduled to remain closed until 2 p.m., local time. Facilities in Northern Ireland, much of Scotland, and parts of Wales also fell under the no-fly decree, as winds pushed the ash plume into the continent's busy skies.