Nothing. Flying in would not require permission of crossing private land to enter, which was a qualifier in your first response. It's being done yearly in some spots with the Durfee Hills of Montana being nearly infamous for it.
True, but flying in is not generally affordable which means, practically speaking, the land isn't accessible to the public.
Hence my problem with all manner of folks having to define "accessible". Means are not a good litmus test IMO. Lots of things I cannot or choose not to afford at this time. Like a pack trip into the Bob Marshall Wilderness. Or a float plane into interior Alaska.
