21.   The operating certificates are required before the airplane can be used to carry commercial passengers.

22.   The old Pan Am operated the first scheduled service across the Atlantic and Pacific oceans and was the first to use jet airplanes on commercial flights.

23.   The new airplane will be used for similar purposes.

24.   They plan to adjust by using smaller airplanes on less-trafficked routes.

25.   We had good information they were using airplanes.

26.   Operation Lifeline Sudan, an organization that groups aid programs in southern Sudan, has said that the airplane was not used to aid rebels.

27.   Operation Lifeline Sudan, an organization that groups aid programs in southern Sudan, has said the airplane was not used to aid rebels.

28.   Airplanes are used to check gas emissions.

29.   Al Salmi said he did not want to use the airplanes at Sunbird Flight Services near Phoenix, where Casdorph worked.

30.   British Airways will use the airplanes it is taking out of the market to add new services to Tehran, Iran, and Kuwait City.