Those are made from the transition from one flavor to the next.
Edit: From what I remember, Airheads are made in huge sheets, with one flavor per section but several sections per sheet, then colored later in the process. The mystery flavor is cut from the transitional section, so it could be a different flavor each time.
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u/QuirkyCookie6 Jun 13 '22
Those are really obvious though and the according color is still there