All shinigamis can float in air if they wanted to . It was first demonstrated during Sora Arc and explained in detail during Ichigo trip to Zangetsu world . But later it got a bit sidelined as many shinigami bankai had wings from Toshiro to Byakuya.
EDIT : First shown in Chapter 5
Last edited by Zu Ra; 2009-07-08 at 08:50.
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