Well, if you want to reset the pivot point, just go to the hierarchy tab and click "Affect Pivot Point Only" and then "Center to Object" or "Reset Pivot". Either of those should work fine.
And that's one heck of a dihedral you've got on those wings.

BTW: I always make the wings a seperate piece of the aircraft. I even make them in an entirely seperate scene and then merge the two. The way I make the wings "blend" into the fuselage is to just make the joint at the spot where it would be on the real aircraft. If you look at any aircraft, the wings aren't actually a part of the fuselage, they just look that way. There is always a seam somewhere along it, and that's where I make MY seams.