|1943||The first tower was built for the use of the swiss military aviation. It was occupied by a radio operator on request only.|
|1952||The tower is permanently occupied during the military activity.|
|1956||Two air traffic controller are hired.
Construction of the dome of the control tower|
|1959||A third air traffic controller is hired|
|1965||The fourth air traffic controller is hired.
The air traffic controllers obtain their licence for the management of the civil traffic.
The controllers form part of the radio workshop.|
|1969||The radio workshop moves in another building.
|1971||Three air traffic controller ae hired.|
|1972||The control tower separates from the radio workshop|
|1972||The use of the radio becomes obligatory for the civil traffic. The air trafiic controllers also work during the weekend. Seven people form the manpower of the tower|
|1976||Two air traffic controllers are hired.|
|1979||The manpower of the tower passes gradually from ten to fifteen people.|
|1980||The commune of Sion engages two air traffic controllers.|
|1982||Manpower is composed of eleven controllers, two heads of department of flight and two AIS employees. The civil and military traffics are regulated simultaneously and entirely by the military control tower 365 days per year.|
|1984||One controller is hired by the commune of Sion. Replacement of the dome of the control tower|
|1989||Two controllers are engaged by the commune of Sion and one by the Federal Office for Air Force Logistics|
|1990||Installation of the systems of navigation: Localiser, DME SIO et MOT VOR.|
|1991||Installation of Bright Display for radar guidance. All controllers engaged by the commune of Sion are re-engaged by the Federal Office for Air Force Logisitcs.|
|1994||Autumn||Start of the construction works of the new control tower. See pictures|
|1996||October||The new control tower is open|
|1996||The frequency of the control tower changes from 118.550 Mhz to 118.275 Mhz.|
|1997||Spring||Demolition of the old tower. See pictures|
|2001||the 1st of January||The controllers are re-engaged by skyguide.|
|2002||The runway direction changes from 26-08 to 25-07|
|2004||the 23rd of December||New IFR departure procedures.|
|2005||the 26th of March||The website is published.|