In Hinduism, each of the divine gods and Goddesses have their own animal escorts. These are also called as Vahanas (animal vehicles). The literal meaning of a Vahana is something that carries, or pulls. While different Gods are associated with different Vahanas or animal escorts, Lord Indra, the king of Dev is associated with a white elephant called Airavata.
This episode of Holy Tales by Himanshu Sharma will tell you why the mythological winged white elephant, Airavat denied carrying Indra his owner on his back.