Some freeware and payware include parked aircraft on the ground.
I wish they could label them as such, and then we have an option to remove them. Perhaps they should be included in the ‘ground aircraft density’ slider in that case.
As far as I’m aware, addons in Prepar3D allow you to remove static aircrafts from their scenery. And I believe the only real way to remove statics right now for FS2020, is via the Contrail application, with select sceneries. E.g. JetStream LIML, as linked in this picture:
Having this option in the Marketplace would be extremely nice to have, as I assume it will trickle down to all other platforms, such as Orbx, and the other sceneries on Contrail.