The pilots, who were unknown to the authorities but believed to be sympathetic to ISIS, were using the emergency "Mayday” channel in the belief they were not being monitored. "Alarm bells rang after several communications in code involving overseas airline pilots were picked up by chance. Troops were on several hours notice to deploy as part of Operation Templer,” a senior intelligence source was quoted as saying by the newspaper.The intercept took place in the week after the Paris terror attacks November 2015, the Sunday Express reported. "The areas we believed these attacks might take place were given extra surveillance."We immediately passed these to the security services who then asked us to monitor certain airlines entering UK airspace,” the source said.Although they used coded messages from the cockpits of their passenger jets, GCHQ used the Arabic transcripts to established they were talking about attacks on London, Bath, Brighton and Ipswich.It is thought the pilots were preparing to smuggle in explosive devices or chemical weapons.

The conversation was intercepted by Royal Air Force (RAF) operators base-d at the printed door mats factory National Air Traffic Services (NATS) control centre in Hamp-shire, on the southern coast of England.A terror plot to attack four cities across Britain was foiled by the authorities after they intercepted two foreign airline pilots, believed to be sympathisers of ISIS, discussing the targets, a week after the Paris terror attacks.The uncovering of the plan raised the terror alert in the UK and was one factor which led to Operation Templer, involving 10,000 soldiers being deployed to support the police on Britain’s streets in the wake of the Paris attacks which claimed 138 lives. The messages were intercepted as they flew from a European airport, thought to be Schiphol, in Amsterdam, to Middle Eastern destinations.. We can only assume that they considered it safer to use this frequency than other modes of communication”. They coded their language with musical references, often referring to "hits”.The two commercial airline pilots, one of whom was flying for an airline on an intelligence service watchlist, were intercepted talking about the plot and the information passed on to Britain’s spies at the Government Communi-cations Headquarters (GCHQ)

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