You can see a real-time display of aircraft that have possible GNSS interference at https://globe.adsbexchange.com/?badgps
If you look at that for a few seconds, you'll see that it's almost entirely civilian passenger aircraft that are not making erratic movements, and that are near conflict zones.
Detecting GPS jamming with planes actually works a lot better than from a fixed terrestrial object, because 1. They have greater sensor range, 2. There are lots of them, 3. They move and cover lots of area, 4. they cover e.g. parts of the Black Sea where it would be more difficult to put a ground-based sensor.
It might be sampling bias. More military aviation with erratic movement and also planes turning off and on their transmitters.
To measure GPS jamming, you should measure from a fixed object. Trying to do that with planes is unnecessary hard.