Travelport, owner of the Galileo and Worldspan GDSs, is planning a $3.2 billion initial public offering in London, reports Bloomberg News.

Travelport is majority-owned by private equity firm Blackstone Group. Blackstone and its partners acquired Travelport from Cendant for $4.3 billion in 2006.

In addition to the two GDS companies, Travelport owns tour wholesaler GTA and 48% of public company Orbitz Worldwide.