1.   And a sophisticated electronic controller keeps all the systems working together.

2.   As a result, controllers must keep planes flying at the same altitude separated by five miles.

3.   Controllers also would keep planes out of closed airspace, such as that over the White House.

4.   For example, FAA regulations usually require air traffic controllers to keep airplanes at least five miles apart horizontally during low-visibility conditions.

5.   The central controller keeps its electronic eye out for any device that it knows is moving around the building, like the one that Ward wears.

6.   The space shuttle Discovery was being readied for launching Wednesday as NASA controllers kept an eye out for uncertain weather and for woodpeckers.

7.   Air traffic controllers staged a strike Monday to demand pay increases, but the government said senior officials and military controllers kept most scheduled services running.

8.   Air traffic controllers kept Cairo airport open, but diverted some flights to Cyprus and airports in eastern and southern Egypt.

9.   Clear skies were forecast for touchdown, although flight controllers were keeping an eye on crosswinds.

10.   Discovery creeps closer to the Russian space station Saturday as the crew and ground controllers keep watch on a leaking shuttle jet.