"LA X" comprises the 104th and 105th episodes of the American Broadcasting Company's Lost, marking the premiere of the sixth and final season. It was written by show runners/executive producers Damon Lindelof and Carlton Cuse and directed by executive producer Jack Bender. Both parts were aired on February 2, 2010, on ABC in the United States and CTV in Canada, and on February 4, 2010, on RTÉ Two in Ireland.

The sixth and final season of the American serial drama television series Lost commenced airing in the United States and Canada on February 2, 2010. The sixth-season premiere was the first to climb in the ratings year-over-year since the second season, drawing 12.1 million viewers. The season aired Tuesdays at 9:00 pm from February 2 to May 18. The series finale aired on Sunday, May 23, 2010. The finale ran two-and-a-half hours starting at 9:00 pm—pushing the local news back a half—followed by the previously announced post-finale special, Jimmy Kimmel Live: Aloha to Lost, at 12:05 am. The season continues the stories of the survivors of the fictional September 22, 2004 crash of Oceanic Airlines Flight 815 on a mysterious island in the South Pacific. The survivors must deal with two outcomes of the detonation of a nuclear bomb on the island in the 1970s. While the on-island story continues, "flash sideways" show a second timeline, in which Flight 815 never crashes. The season was released on DVD and Blu-ray on August 24, 2010, alongside a complete series box set. Included in the special features was "The New Man in Charge", a previously unaired shortened episode that serves as an epilogue following the events of the finale.