Yes motorcycles and traffic can be loud, but at least it is possible to get away from it. Small planes, on the other hand, can intrude on your silence even many kilometers away from the nearest road. Relaxation recordings of waterfalls, rustling leaves, insect sounds, etc... never include the drone of small aircraft in the background, and the reason is because that aircraft is an intrusion on those beautiful sounds of nature. I notice that many of you are not living in the United States. Unfortunately, for reasons outlined in the article linked below, the US has a huge number of small aircraft, the majority of which are used solely for recreational purposes. The problem I'm dealing with is that the hobby of pilots is interfering with my favorite recreational activities, enjoying the sounds of nature. I go to a park that is 10 kilometers away from an airport, and still there is a constant parade of small planes all day long. Unfortunately the sound of small aircraft travels very far, and when you're hiking and start to hear a plane approaching from the south, it will take several minutes for the plane to pass by and the noise disappear; and when it does, ooops...here comes another one, or another two. I'm posting on this site not to badger, but in hopes of finding real solutions, because I really want to be able to enjoy the sound of the wind in the trees and the sounds of birds.
USA Today Article