No Gravity in 1 Command 2.0 has been released!
Link to paste bin command: Click Here For 2.0 Only works in 1.9
Controls work as follows,
Look up to move up,
Look all the way up to move faster,
Look down to move down,
Look all the way down to fall fast.

I hope you guys find cool used for this!
If you do please give credit to me.

Extra info
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If you want the machine to be on but to not effect specific players use this command;
/scoreboard players set (Username) Fly 0
or /scoreboard players set (Username) Fly 1 to add them back on.
Remember not to put more than 63 command blocks per chunk (reduce lag)