There is an amazing resource that anybody with a computer and an internet connection can access. Flightradar24 tracks flights around the globe and gives you their position, altitude and airspeed. I used this to look at different countries and what their flight paths look like during lockdown.
WHAT DO YOU THINK ABOUT THE VOLUME OF FLIGHTS OVER AMERICA OR ANY OTHER COUNTRY? CAN WE EXPECT LOCKDOWN TO WORK IF AIRPORTS ARE NOT TESTING PASSENGERS? AS EVER, LET ME KNOW BELOW?