11.   Wind-whipped sand blocks the sun and grounds aircraft.

12.   With the foul weather grounding most aircraft, NATO has been able to do little to attack the forces fighting in the field in Kosovo.

13.   Pilots have grounded aircraft if the senior cabin crew are of a higher rank than the co-pilot.

14.   After that crash, the government ordered all Antonov aircraft grounded.

15.   Alaska Airlines spokesman Jack Ware said his company had grounded eight aircraft, including four on Saturday.

16.   Air India said that the aircraft had been grounded while technicians repair it.

17.   Authorities on Thursday ordered all Soviet-built Antonov aircraft grounded indefinitely while investigators examine the causes of two recent fatal crashes involving the planes.

18.   But many aircraft have been grounded by lack of visibility.

19.   Five private Russian-owned aircraft were grounded while officials investigate allegations they flew supplies to former rebels in Angola, officials said Wednesday.

20.   For nine hours Wednesday, U.S. military aircraft will be grounded and artillery pieces will remain silent, the military command said Tuesday.