The chart above shows the number of commercial flights on March 2, April 20, and May 20. In the April 20 trough, the number of flights was down 75% and the 7-day moving average down about the same at 73%. As of yesterday, there are two ways to look at the data:
The first is that the number of fights is still down 63%. That is the sky is half-empty view.
The second is that the number of flights is up almost 46% from the trough and that the 7-day moving average is moving in the right direction. This is the sky is half-full view.
When will things be back to "normal?" Who knows, but things are better than they were and not as good as I hope they'll be soon.
The above data is from flightradar24.com. If you have never looked at that site, it tracks air traffic through a network of individual devices which read the transponders of aircraft. I run a tracking site on a Raspberry Pi, just for fun, so I have access to the data.