1.   Air traffic control had lost radio contact with the pilot.

2.   Clash looms over air traffic control Many critics of Railtrack accuse it of putting profits above passenger safety.

3.   Internet traffic control relies on these numbers.

4.   It is the international language for air traffic control.

5.   The city has introduced an innovative system of traffic control.

6.   The co-operation of air traffic control is central.

7.   This was not an aircraft taxi-ing down the runway, only to be called back by air traffic control.

8.   We will reduce airport congestion by increasing the capacity of our air traffic control.

9.   When he realized that one engine was not working, the pilot alerted air traffic control.