1.   Accounts by military and civilian air-traffic officials agreed the commercial airliner had received proper permission to traverse the zone.

2.   Another factor here has been the slow but invaluable installation of Traffic Collision Avoidance System radar in commercial airliners.

3.   Corinth products find homes in a wide variety of government space and aircraft systems instead of on commercial airliners.

4.   For a concrete example, consider again the commercial airliner industry.

5.   American officials insisted that the plane emitted smoke to signal its location to a passing commercial airliner.

6.   An American Airlines commercial airliner departing from Kennedy Airport crashed into a residential neighborhood on Monday morning just minutes after it took off.

7.   And by definition, Air Force One has to be an Air Force aircraft and not, say, a commercial airliner.

8.   And they used four commercial airliners to do it.

9.   And yet you have admitted that you yourself refuse to fly, even on a commercial airliner.

10.   As news broadcasts replayed the horrifying images of commercial airliners hitting the World Trade Center and the Pentagon Tuesday, retailers fearing more attacks closed for the day.