Airborne incursions offer clear evidence that Norad needs an upgrade: U.S. expert

Canada and the United States are eyeing the sky with suspicion these days, as well as the shared continental defence system that's supposed to be watching it for them.

The North American Aerospace Defense Command, or Norad, appeared to lose track of the mysterious object that was eventually shot down Sunday over Lake Huron.

Jamil Jaffer, executive director of the National Security Institute at George Mason University in Virginia, says that's just one example of why Norad needs an overhaul.

Jaffer says it's unclear if the challenges posed by the recent flurry of overhead encounters represent a lack of capability, a lack of attention or a combination of both.

Three separate objects were blown out of the sky in as many days after what U.S. officials say was a Chinese surveillance balloon floated across the continent two weeks ago.

U.S. and Canadian recovery teams are battling difficult conditions to retrieve the debris from three locations: the frozen Arctic Ocean, a remote stretch of Yukon and the depths of the Great Lakes.