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History of the Control Tower of Sion

The control tower is built within the military part of the airport. At first, it was used only for management of the military traffic. Since 1966, when the radio became obligatory on the airport of Sion, it is used also for the civil traffic. Until 1991, the military aircrafts and the civil aircrafts used separate frequencies. The unification of the frequencies was imposed by the introduction of the civil IFR.
The air controllers formed part of the personnel of the military air base of Sion until 2001, date of the reunification of air navigation services in Switzerland and foundation of Skyguide.

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