Travelport Ltd. said today that it plans to sell part of its online travel-booking subsidiary Orbitz via an initial public offering. No specific size or price details have yet been determined. Blackstone Group and Technology Crossover Ventures bought Travelport from Cendant earlier last year for $4.3 billion, and later agreed to added on PE-backed Worldspan for $1.4 billion. www.travelport.com