Who are the Tailies?

Question: Who are the Tailies?

The term "Tailies" was first introduced in Episode 2x4, Everybody Hates Hugo.

Answer: The Tailies are the survivors of Flight 815 who were in the tail section of the plane when it crashed. Twenty-three Tailies originally survived, but by the time we caught up with them, only five survivors were left: Ana-Lucia, Eko, Libby, Cindy, and Bernard.