Encounters with Avatar Aang

[anatural]

September 30, 2012: Korra has a vision of Aang on the mountain with the guru while fighting with Hei.
November 16, 2012: Korra has a vision of Aang and Zuko performing the dragon dance.
December 7, 2012: After another encounter with Hei, Korra has a vision of Zuko telling Aang about his childhood.
December 7 - 11, 2012: Korra has nightmares about Zuko chasing Aang.
February 3, 2013: Korra connects with Appa's spirit, and he gives her a vision of his meeting with Guru Pathik.
March 15/16, 2013: Aang gives Korra a night free from nightmares.
April 10, 2013: Aang is a part of Korra's dream curse. (Hei, Jinora)