Orbitz Worldwide Inc., the online travel Web site owned by Blackstone Group LP, could raise $612 million by selling shares in its second initial public offering in four years.

The company plans to sell 34 million shares at between $16 and $18 a share, and underwriters have the option to buy an additional 5.1 million shares, Chicago-based Orbitz said Friday in a regulatory filing. The company applied for a New York Stock Exchange listing under the symbol OWW. Orbitz initially filed for an IPO in May, but didn't disclose the number of shares to be sold, the price range or which exchange it sought to be listed on.

Orbitz is part of Travelport Ltd., which was bought by buyout firm Blackstone in August for $4.3 billion from the former Cendant Corp.

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