11.   By punching a few buttons, controllers are able to use the backup system if it is available.

12.   Controllers are even more unnerved when the ground-to-air radio equipment they use to communicate with pilots fails.

13.   Controllers were baffled when radio signals from the main antenna disappeared, indicating touchdown, then reappeared.

14.   Controllers were in the temporary facility about four hours after the quake and began ferrying planes in and out of the airport by radio.

15.   Controllers would then be able to monitor all the traffic on the ground, even when visibility is poor.

16.   Controllers also are concerned that the back-up may be down for occasional routine maintenance when the primary system crashes.

17.   Controllers are happy with the pay increases but say that management has become tougher.

18.   Embedded controllers are specialized microprocessors that are responsible for most of the neat new functions found in everything from video-game players to microwave ovens.

19.   Financial controllers also are in demand.

20.   For a time, flight controllers were not sure when, or if, they would be able to get Sojourner up and running.