I would hope that the NPS also banned surface vehicles with ICE motivators, such as four-wheelers, motorcycles, AWD pickups, etc, or this whole thing is pretty much a sham. Ground vehicles do far more damage to the environment that an airplane does. Airplanes don’t leave trails and ruts in the forest, run over animals, possibly spark fires from poorly maintained exhaust pipes or overheated catalytic converters. Pilots rarely leave their trash behind, throw beer bottles and cans in the brush or use the trees and animals as target practice with the gun they brought along “just for fun”. In fact, if you were to ask park rangers what their biggest problems are for keeping the parks “pristine”, i doubt that pilots and airplanes even make the top ten.