This is a glitch that involves tricking the game into thinking Link is still on a ladder, allowing you to climb upwards into the air. There are 3 known methods for initiating an air climb
This is the most up-to-date version and the most powerful. All that is required is the Sword, Roc's Feather, and either the Shield or Pegasus Boots. This means that it can be performed very early in runs
This version requires a Guardian Acorn or Piece of Power to perform and was previously used for Angler Key Skip (video pending)
This is the oldest version and is still preferred by some runners during the late game segments (video pending)