Air... Only Air [Skyblock] 1.3.0 is a release file of the Minecraft map Air... Only Air, made for Minecraft 1.9.1, 1.9.3, 1.10-Snapshot, 1.9.4, 1.9.2, 1.10.2, 1.11, 1.10, 1.10.1, 1.9, 1.11-Snapshot. It was published on December 21, 2016 and is 2 MB in size. For the full description, screenshots and every other version, visit the Air... Only Air map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.