A private airstrip permits terrorist trainees to visit the place without leaving any visible "signature" of their ever being there. No motel records, no gas station or restaurant credit card receipts. Never seen by the local LEOs driving in or out. No proof they were ever there.
The airstrip was already there. It was put in by Synanon way back when, but Synanon couldn't keep a permit to operate it and it hasn't been used as a working airstrip in a long time.
The report had no info regarding current use of the airstrip. I would guess the prior owner, Synanon built it. Maybe someone from that area knows about that. I know that Synanon was like a drug rehab, type employment, cult camp or something that made promotinal products like pens and such with company name on it.