HC Deb 24 February 1987 vol 111 c188W
Mr. Cohen

asked the Secretary of State for Transport in what circumstances air traffic controllers are permitted to listen to conversations between pilots and their bases in other countries; to what use such information may be put; and if he will make a statement.

Mr. Michael Spicer

Air traffic control matters are the responsibility of the Civil Aviation Authority. The CAA has informed me that air traffic controllers monitor designated air traffic control frequencies used for the purpose of providing air traffic or alerting service. They do not monitor airline company frequencies