51.   The satellite would be used to monitor air-traffic as well as weather.

52.   Thieves have stolen valuable equipment used to monitor the active Popocatepetl volcano near Mexico City, officials said Friday.

53.   Two police helicopters being used to monitor traffic will be recalled for this purpose, backed by aircraft pledged by businessmen friends, he said.

54.   The device can also be used to monitor communications between airline pilots and air-to-ground communications.

55.   The land houses a US Navy telecommunications facility reportedly used to monitor communications in North Korea and China.

56.   The latter will be used to monitor desertification, tropical rainforest destruction and pollution.

57.   The official said their understanding was that the facility would be used to monitor civilian satellites and was not a military facility.