I don't usually engage on conspiracy theories but why not provide more detail? If you've seen the planes, then you can use an app to figure out what the aircraft is and the owner also. You could then share that data here. What company and/or entity is "they" here?
Which National Parks?
What endgame are you proposing here? What's the goal?
Which National Parks?
What endgame are you proposing here? What's the goal?