I think Gardener and I are about the only ones going down this private plane theory road. In my case it's based upon the distance that KKL had to travel - if she she only had the holiday (long) weekend to travel to Colorado. Everything is a big IF. We don't know if she had vacation time that took her to Colorado earlier than Thanksgiving. The more time she had, the more possible it is that she drove. In something like a three day period it becomes less likely. That is a LONG drive.
I don't know if this true and someone else may, but I'm under the impression that there are a lot of private pilots out west. A friend who'd lived in Colorado told me that decades ago but who knows if she was right. If it is (more "ifs"), it increases the likelihood that PF and/or KKL have such an acquaintance. The thing is, if that's part of how things went down, then the private pilot would have to have been privy or a party to the murder. A pilot who wasn't and just flew KKL, would be a huge risk to the plan once they heard about this case because they would undoubtedly come forward. I would imagine that LE knows if, when and how KKL traveled to CO, by now. If I were an investigator and how she traveled was in question, I'd have checked all of the private flights between the Twin Falls area and as far as Colorado Springs. My fear in a scenario like this - a complicit, third party, private pilot - is that the body could be dumped over a remote area, from the plane. Sounds wild and more like something in a drug cartel type of case but it's a possibility in terms of theories.
The other thing I was thinking, regarding that landfill, was that maybe it's possible that a third party took the body to the Colorado Springs area, or wherever feeds into that landfill, in order to dump it. I'm certainly going to implicate anyone as that possible third party but ya'll can use your imaginations.