From April 18 to April 22, 2017, an unarmed Russian Federation Tupolev TU-154M aircraft will undertake a transit flight over Canada en route from the United States to conduct an observation mission under the Treaty on Open Skies, according to the Department of National Defence.
The Russian Federation aircraft will stop at 8 Wing Trenton after their observation overflight of United States territory and again prior to returning to the Russian Federation, the DND noted.
Russia usually only conducts one flight a year over Canada. The Canadian SJS ACV team is currently flying over Russia with a Czech team (and Russian observers).
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Source: Ottawa Citizen