1.   Al-Hallak has been questioned by federal prosecutors about alleged links to Osama bid Laden and the hijackers who crashed jetliners into the Pentagon and World Trade Center.

2.   Hani Hanjour, the suicide hijacker who crashed a jetliner into the Pentagon, also trained on the simulator.

3.   Hanjour has been identified as the hijacker who crashed a jetliner into the Pentagon.

4.   It followed a four-day shutdown of Wall Street after hijackers crashed commercial jetliners into the World Trade Center and the Pentagon.

5.   The terrorists then crashed the jetliner into the Pentagon.

6.   A Turkish Airlines pilot drew criticism Friday for crashing his jetliner in a snowstorm despite repeated warnings from the control tower to turn back.

7.   As a part of heightened homeland defense, the missions began after terrorist hijackers crashed jetliners into the World Trade Center and the Pentagon.

8.   But Nicholas Chiafalo also worked as a New York City firefighter, and was killed when hijackers crashed two jetliners into the World Trade Center.

9.   Less than a month later, while Moussaoui was still locked up, terrorists crashed hijacked jetliners into the World Trade Center and the Pentagon.

10.   Marquard said another factor in the decision was uncertainty over the availability of flights after hijackers crashed three jetliners into buildings in New York and Washington.