Claire becomes suspicious of Charlie when he exhibits peculiar behavior after she comes up with an idea that could get everybody rescued.
Meanwhile, tensions mount between Sayid and Locke as they continue their trek to rescue Jack.
original airdate--March 14,2007 rating--12.48 million
music--"Main Title" (Composed by J.J. Abrams)
Goof: When Claire follows Desmond, and Desmond catches the bird, his right shirt sleeve changes positions between shots at around (time stamp 33:30). As he reaches out to pick up the bird, his right sleeve is fully extended. When he turns to show the bird to Claire, the sleeve is up above his elbow.
Trivia: The book Sawyer is reading is 'Fountainhead' by Ayn Rand.
Title Meaning: The French phrase "Par avion" literally means "by airplane" but also translates as "air mail". Claire uses birds to send a message so the survivors may be rescued.