[He gave a thoughtful look.] Hmmmm, I wonder. Originally it was to test the wind and experiment on the effects of Sylph's powers. Though really, it's hard to say where those planes have gone even till this day. But it acted as a basis watching each one at different altitudes and the like.

[Maybe the nostalgia was getting to him but he took a deep breath and began to recite something he said in the past as a joke with much enthusiasm.]

Oh Wind~~ where are you blowing from~ and where are you blowing to~~? You are so similar in spirit with humans that, in other words, perhaps your reasoning is the answer itself to the philosophical proposition of where we are from and where we are to go to....

[He laughed.] Something like that is what I thought of day in and day out during those days. Wasn't I a hard worker?