Almost a year ago, Flightradar24 stats of aircraft detected within 400 km radius from Nagu showed the substantial drop of air traffic. Pre-COVID-19 daily figure was about 750 aircraft a day, and in April 2020 the figure was a bit over 200 (https://rosti.fi/saa/flightradar24-statistics-2/).
Some recovery has happened. For quite a long time now, the figure has been around 300-350 aircraft per day. But seems that it will take some time before total recovery, if that even happens. Of course, COVID-19 must be over globally before we can hope completely free travel again, but then again, is it possible that we now have learned that all travel is not necessary?