Quote Originally Posted by Zetsumei_Tsunarashi View Post
Pretty sure the Airship islands things are instanced content, not open world.
They're actually a compromise in between. They've specifically said that you may find yourself sharing a discovered island with another group that also found it so it's not entirely instanced in the way a dungeon or trial is. I suspect they'll be using limited instancing akin to how open world regions were instanced when 3.0 launched.