1) They need to keep their options open so they can balance the passenger load among the three rotations. Imagine how mad some of the compulsive planners on this board would be if they made their plans based on the rotation they thought they were getting, and then DCL had to change their rotation!
2) If they told people which rotation they were getting, they'd be inundated with phone calls from people demanding a different rotation, for whatever reason.
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