11.   With no service, five airports closed last year and a sixth closed this month.

12.   A curfew has been put into place and the airport closed, according to BBC World Service radio reports.

13.   Air traffic controllers in the French provinces unexpectedly joined the strike, causing five major provincial airports to close and resulting in flight delays in Paris.

14.   Area airports closed.

15.   Area airports closed due to poor visibility and danger of flying ash and rocks.

16.   But several eastern airports closed Monday evening.

17.   But the airport closed again Wednesday - this time because of poor weather conditions caused by snow.

18.   But several airports closed Monday evening.

19.   City officials told him the airport must close by the end of the month because the surrounding area has drastically changed.

20.   Copenhagen airport virtually closed, and several ferries and ships stayed in port.