Did you talk to Zixzax again, etc, and see if that will enable the observatory waypoint? Can you use the teleporter stone from the homestead? (I never tried that)
Yes, we have tried exhausting all of his dialogue options. What is the teleporter stone? If it's not accessible from the plane, then I'm afraid we don't have it. If it's the Homestead button, then we have all ready tried that.
