Spirit Falls With Indigo Stake Sale Seen as Step to Frontier

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Spirit Airlines Inc. fell the most in 10 months as investor Indigo Partners LLC prepares to sell its holdings in a move that may be a step by the private-equity firm to bid for Frontier Airlines.

Spirit declined 8.3 percent to $32.45 at the close in New York, the biggest one-day drop since September, after Indigo filed to liquidate 12.1 million shares, or a 17 percent stake.