Jet propulsion: Skilled firebending masters are able to conjure huge amounts of flame to propel themselves at high speeds on the ground or through the air. Normally, this can only be used for short periods of time by regular firebenders; however, when augmented by Sozin's Comet or the Avatar State, the technique can be used for sustained levitation and flight. It was first demonstrated by Azula during her battle with Aang in the Crystal Catacombs. During the fight, Azula released the flames she used to propel herself horizontally, which blasted Aang backward. Azula used this skill to propel herself through the air over the boiling lake, as she was pursuing Zuko, Sokka, and Suki when they were escaping the prison. When Azula was knocked off an airship, she used a smaller burst of fire to propel herself on to a cliff, saving herself from falling to her death. During Sozin's Comet, Ozai and Jeong Jeong were capable of utilizing this skill with much more proficiency than Azula had ever shown. Azula and Zuko both executed this technique while powered by the comet during their Agni Kai, and Phoenix King Ozai used it extensively during the battle at Wulong Forest with Aang. It was also used by General Iroh of the United Forces as he flew through the air above Republic City while defending against Equalist planes. This technique can also be used to briefly run across a vertical surface as Mako and Korra did during an Equalist rally. Korra also used it to propel herself through the air during her fight with Zaheer.