United Airlines will begin offering daily, nonstop service between Houston and Sydney on January 18. At 8,596 miles, it will be United's second-longest flight. Its Los Angeles-Singapore flight remains the longest. Patrick Quayle, vice president of international network for the carrier, said the new international flight is possible because United is rearranging flights at Bush Intercontinental Airport in Houston this fall to make connections more efficient. The new route will provide more than 70 cities across North America with one-stop service to Sydney. For example, United customers originating in Charlotte, N.C., currently have to fly to Chicago to connect to San Francisco to get to Sydney. With United's new flight from Houston, customers would have just one stop.