Avergae number of flights in the global skies at any time?

I’m sure this has been asked before - but I’m new to this site and am looking for answers to help with my child’s school report. Doens’t need to be scientific (can imagine figures change with seasons, and economy) but is there any information out there that puts a number on total commercial flights in the sky around the world at any time?

Advance thanks for your help.

We track about 7000 total (commercial and GA) during the peak of the day, but our worldwide coverage is not comprehensive. For a round number averaged over the day, I’d guess maybe 5k.