"Air War" is a single by Crystal Castles. It was released on 17 December 2007 by Trouble Records as a 7" vinyl. An earlier version of the song was released in July 2006 as the B-Side to "Alice Practice" on Merok Records. The lyrics are from the James Joyce book Ulysses in Chapter 11: Sirens. The cover art gathered public interest because of the odd picture of Ethan Kath and Alice Glass with ice cream cones as heads.