The process saw a state-of-the-art robot, which was lifted to the top of the tower cab, and working from the inside out will take the tower down slowly.
The tower, which officially opened in 1988, was the previous home to Nav Canada operations at Calgary International, is scheduled to be completely dismantled by October 31.
It stands 44.85 metres (147.1 feet) high and supported a 414 square-foot cab where thousands of successful aircraft arrivals and departures were managed until the new control tower went into service in May 2013.
The land, which boasts some of the best available airside access space will be redeveloped.
Access to the roads near and around the former control tower at Calgary International is restricted to business related traffic only, and there is no public access to this area.