The fly over is a fact gathering terrain mapping to aid the CCP in their initial land invasion from Canada into the most unpopulated northern states.
The initial attack will include a power grid failure to large swaths of the US, which will cause chaos and divided resources while Chinese infantry take their first territories.
Not only that. Trudeau in his first Act as PM gave China control of large swaths of British Columbia under the guise of protecting their gas interests there. They are allowed their own "security forces" which use unmarked military grade equipment. They have been harrassing the indigenous population and there were at one time many stories covering this since 2015. They are hard to find now and I wasnt archiving everything at that point.