Launched in the first week of September, Orbitz For Business now has about 30 clients whose T&E volumes range between $250,000 and $10 million, a spokesperson said today. The airline-owned, online travel agency named Chicago-based Centerprise Advisors, a two-year-old professional services firm with about 1,000 U.S. employees, as one of its first clients. Orbitz also now offers online enrollment.