Online travel Web site Orbitz LLC has gotten off to a stellar start, logging more new visitors in its first month of operation than any site launched since 1999, according to new research released by Nielsen/Net Ratings.
But whether the Chicago-based company can sustain its high traffic—and, more importantly, turn casual visitors into paying customers—is still a question, analysts say.

Since its official launch in June, Orbitz — spurred by a $75-million marketing blitz that includes kitschy television ads — has garnered 1.9 million new visitors, compared with previous Nielsen leader Walmart.com, which gained about 1 million new visitors within the first month of its re-launch.

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