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.
And don’t they already have “rights” to our power grid?
Securing the U.S. Power Grid: President and Commerce Department Sound the Alarm
https://www.hklaw.com/en/insights/publications/2020/05/securing-the-us-power-grid-president-and-commerce-department
Stopping Chinese Communist Involvement in the Power Grid Act would continue Trump’s ban on equipment purchase or use from six adversaries, including China
https://govtrackinsider.com/stopping-chinese-communist-involvement-in-the-power-grid-act-would-continue-trumps-ban-on-7c0372efb2f