I recently rewatched the epic battle between Netero and Meruem in the 2011 anime. I noticed that most of the time, Netero "floated" in front of his summoned Kannon. (I am lazy now to include snapshots, but believe me, he was not just "jumping").
IIRC, in the final battle in The Last Mission movie, Netero stood in front of his Kannon by standing on one of Kannon's palms, which was a very clever and reasonable way to keep a high position.
This leads me to question: How did Netero manage to levitate during his fight with Meruem?
So far (both in the manga and the anime), no Nen user was shown levitating, just flying at best (and using wings in those cases). Of course, the answer to my question can be "By using Nen", but frankly, it would be a very inefficient way to use it (c'mon, just reserve one of Kannon's palms to lift you, and leave the other 99 for "ant swatting").
ADDENDUM: The scene that made me think about all this is in episode 126 at 6:17