Is the chain spear (flying talon) a double weapon?
It's not listed as such, unlike all of the other double weapons, but it has damage listed as if it might be (1d6/1d6).
I could see it going either way. I could see it as a two-handed exotic that you can use either one or the other end at a time, but not both in a full attack. Or it could be a two-handed exotic weapon in which you can use each end in a full attack, using either end as the primary weapon and the other end as off-hand.