Online travel website company Orbitz Worldwide expects to lay off 40 percent of its Chicago workers over the next year. Orbitz, which was acquired this year by Expedia, the online hotel booking company, intends to lay off 326 people beginning Dec. 4, the Puget Sound Business Journal reported Wednesday. Orbitz has about 800 workers at its Chicago office. The Illinois Department of Commerce and Economic Opportunity did not answer an inquiry about layoff plans filed by Orbitz or Expedia. Orbitz declined to comment Wednesday. Expedia completed is $1.3 billion takeover of Orbitz in September.