Season 1:
* "The Boy in the Iceberg": Aang cries after being awakened from his 100-year slumber, overwhelmed by the realization of the world's state and his role in it.
* "The Southern Air Temple": Aang tears up when he discovers the ruins of his former home, the Southern Air Temple, and the fate of his people.
Season 2:
* "The Avatar State": Aang cries after being unable to control his Avatar State, which leads to the destruction of an entire village.
* "The Library": Aang cries after learning about the terrible fate of his people, the Air Nomads, and the destruction of their culture.
* "The Guru": Aang cries in frustration and despair as he struggles to overcome his fear of the Avatar State.
Season 3:
* "The Firebending Masters": Aang cries after learning about the Fire Nation's history and the pain and suffering caused by their people.
* "The Day of Black Sun": Aang is visibly distraught after losing Katara and Sokka in the battle against the Fire Nation.
* "Sozin's Comet": Aang breaks down emotionally before his final battle against Fire Lord Ozai, overwhelmed by the weight of his responsibility.
Other Notable Episodes:
* "The Storm": Aang cries after witnessing the devastating effects of a storm in the Earth Kingdom.
* "The Avatar and the Fire Lord": Aang cries after learning about the Fire Nation's plans to attack the Earth Kingdom.
It's important to note that while Aang is a powerful warrior and spiritual leader, he is also a child who experiences loss, grief, and fear. His tears reflect his humanity and the emotional complexity of his journey.