Gently push the tip of a spudger under the black plastic flap stuck to the display data cable lock to make the lock pop upward and away from the socket.

While holding the lock away from the socket, use the tip of a spudger and your fingers to gently remove the display data cable from its socket by sliding it toward the corner of the Air.

Do not pull upward on the display data cable as you disconnect it, as its socket may break off the logic board.