What?!? Please cite some sources for that. I visit Yellowstone regularly and I have friends that are National Park rangers there and we've talked drones in Yellowstone extensively. I've never once heard or read of such a thing, and I seriously doubt it. However, though I know an awful lot about Yellowstone, I admit I don't know everything. Concerning overflights in Saguaro NP, the only thing I know and care about is that launching and landing from outside park boundaries keeps me legal as far as the Park Service rules go.I know there are some unknown exceptions to unmanned flight over NPS designations. Be careful please.
Even Yellowstone NP has a designated place for hobbyist. i.e., AMA designated airfield.
To: