1.   A transponder is a device that emits radar signals identifying and locating aircraft for air traffic controllers.

2.   And the air traffic controllers and pilots on board asked for autographs.

3.   Denver said, waiting for air traffic controllers to confirm they could trace his signal.

4.   Piloting a career at any level without honest feedback is the equivalent of dismissing all the air traffic controllers at the airport.

5.   The personnel include air and ground crews, communications experts and air traffic controllers.

6.   The pilot had been in regular contact with air traffic controllers but did not report any difficulties.

7.   There was poor communication between the air traffic controllers and the aircraft.

8.   French air traffic controllers have begun a three-day strike in a dispute over pay.

9.   Frequent computer analyses could tell whether workers, like air traffic controllers, are seeing all activity clearly enough to monitor it properly.

10.   Besides questioning the pilot, air accident investigators will also want to talk to air traffic controllers and to the Civil Aviation Authorities airport safety experts.