Appa is a fictional character in Avatar: The Last Airbender. He is Aang's loyal Sky Bison. Aang and Appa, along with Momo, have a strong bond to each other because they are each the last of their kind. He is most noted for his ability to fly in spite of his heavy weight, a feat achieved through Airbending. This makes Appa the primary means of transportation utilized by Team Avatar.