21.   Such convenience is also prized by several corporations that use the airport, including MGM Grand, Litton Industries, Guess?

22.   That is why the carrier uses many secondary airports, where departure gates are more readily available and operating costs are lower than at bigger airports.

23.   The airline canceled several flights into Medan after the crash, but airport officials said other carriers continued to use the airport.

24.   The airport is mainly used by the air force.

25.   The airport is being used by the U.S. Air Force in support of military activity in Afghanistan.

26.   The company also projects an increase in the number of cargo planes using the airport during the day in the next decade.

27.   The official did not specify which airports were used.

28.   The regime covers the landing fees that BAA can charge airlines that use its airports, which include Heathrow, Gatwick and five others in Britain.

29.   The Transportation Department had devised a program to address security concerns, in hopes of allowing corporate jets to resume using the airport.

30.   The United Nations stopped using the airport, one official said, arguing that routing its plane through New Dehli would cost the extra time and money.