I believe the list I compiled on the wiki is complete:
http://wiki.project1999.org/index.php/Plane_of_Sky
The ones still missing:
Agilmente's Flute of Flight(Ervaj's Flute of Flight)
Songweaver's Mantle(Mantle of the Songweaver)
Mask of the Songbird(Mask of Song)
Darkwood Aegis(Aegis of the Wind)
Glowing Pauldrons(Pauldrons of Piety)
Band of Screaming Winds(Band of Wailing Winds)
Yannikil(Arydryidriyorn)
Sphinx Eye Amulet(Amulet of the Sphinx Eye)
Spiroc Warhammer(Warhammer of the Wind)