A few examples of how the skies have changed in the last month.
This is global flight traffic 1-31 March each day at 15:00 UTC.
1 March at 15:00: 14,629 flights
31 March at 15:00: 5632 flights
Live flights: flightradar24.com
Zooming in a bit, images again show traffic 1-31 March each day at 15:00 UTC (peak traffic).
1 March at 15:00: 4,592 flights
31 March at 15:00: 865 flights
And over to North America. These images are from each day at 18:00 (peak traffic).
1 March at 15:00: 8,396 flights
31 March at 15:00: 3,166 flights