Wing Gate

I question the practices and purposes of the circling aircraft.
I make two calls to try to get answers.
If you are tight for time, skip minutes 31-37

This may be interesting reads:
https://www.airuniversity.af.edu/Portals/10/ASPJ/journals/Volume-32_Issue-1/F-Card.pdf

Cessnas turned drone:
https://www.airforcemag.com/Cessna-Turned-Drone-Foreshadows-Future-Unmanned-Opportunities/