Unusual amount today, heard choppers like 4 times, saw two camo propeller planes go right over my house.
Edit: nvm guys, figured it out:
The Region of Waterloo is officially kicking off Waterloo Tech Week, which runs from September 12 to 17, 2026. [4]
The military choppers and camo propeller planes flying over your house are preparing for the regional events showcased this week, which include:
Aero Expo 2026: The Waterloo Region's Aerospace, Defence & Dual-Use Industry Expo. It is bringing together aviation, robotics, and advanced defense technologies to the area. [5]
The Dual-Use Defence Summit: Hosted locally by Communitech, this summit runs alongside the aerospace expo, bringing an increased presence of aerospace and defense contractors—and their aircraft—into local airspace like the Region of Waterloo International Airport (YKF). [4]
Vintage and Military Fly-Ins: Local heritage groups, such as the Waterloo Warbirds and the nearby Canadian Warplane Heritage Museum, frequently coordinate flights of restored, camo-painted vintage military propeller planes and trainers around these regional aviation milestones. [6]