71.   The prospect of terrorists launching a shoulder-fired missile at a commercial airliner has haunted the intelligence community for years.

72.   The NRC, however, said it had not analyzed how the containment buildings would hold up under a direct hit from a large commercial airliner.

73.   The stream of smoke released by the plane, they said, was a signal to alert a nearby commercial airliner of its position.

74.   Their ages were typical for Air Force pilots, but perhaps younger than one might expect to find on comparable commercial airliners.

75.   Thomson believes commercial airliners could also benefit from the system, although it would be restricted to modern fly-by-wire planes.

76.   To fly into a jet stream, the windy region where commercial airliners fly, an electric current is fed into the conductive tether.

77.   U.S. officials insisted that the plane emitted smoke to identify its location to a passing commercial airliner.

78.   What was he doing on a commercial airliner instead of flying safely under guard on the private Justice Department airline that is operated expressly to transport prisoners and deportees?

79.   Whatever the reason, commercial airliners were allowed to fly again three days after the hijackings of four jets.

80.   Witnesses told local television stations that the plane had appeared to be a commercial airliner.