21.   Officials decided to use the aircraft for international service from Philadelphia, but want to return to Boston.

22.   On other routes, Delta used larger aircraft.

23.   One possibility is using unmanned aircraft to take over the role of delivering mail and packages, Ettinger said.

24.   One proponent suggests the CIA may want to use the aircraft to protect cargo planes carrying drugs and arms between the United States and foreign nations.

25.   She noted that different carriers use different aircraft, which have more or less space in the cabin.

26.   Skymark plans to use leased aircraft, contract out maintenance and operate its aircraft using cheaper foreign flight crews.

27.   The aircraft is used by the Air Force and the Marine Corps.

28.   The aircraft is used mainly for in-flight refueling of helicopters but can also be used to refuel other planes.

29.   The chairman said Emirates could use the aircraft today on some routes, including London and Bangkok.

30.   The mightiest superpower in history, it seems, has suddenly been laid naked by terrorists willing to use commercial aircraft as weapons in a war that targets civilians.