User blog comment:Imhungry4444/Chapter 694 Review/@comment-1595565-20121227203950/@comment-202.129.164.250-20121231070120

It's his DF ability. My belief is that DoFlamingo uses the String String Fruit. Besides controlling other people like puppets, use a "string" to dismember or cut, and he can use strings to suspend himself in midair and move forward with an appearance like he's flying.