1.   And communications between controllers in the east and west towers have become more complicated and time-consuming, which controllers say could hamper appropriate action during emergencies.

2.   Arms controllers say the growing complexity of the situation calls for a global ban on anti-satellite testing.

3.   A new ground radar system, which controllers say is essential for safety during fog and heavy rain, is installed only in the central tower.

4.   Air traffic controllers said the hijackers had threatened to blow up the plane in the air.

5.   Air traffic controllers say they believe there is a problem with the Gibbsboro radar, which was brought online in September.

6.   Air traffic controllers said at the hearing that efforts by the government to train more controllers were falling far short of the number projected by Congress.

7.   But controllers say congestion is growing, especially in the New York region.

8.   But at other airports, airlines are quickly adding back capacity to the peak travel times, threatening to overload the system, air traffic controllers say.

9.   But controllers say that a data block disappearing from radar is a shock.

10.   But controllers say they have little experience working on DARC.