Boeing said it and its and partners achieved significant reductions in fuel consumption and carbon dioxide emissions using Tailored Arrivals during a trial earlier this year at San Francisco International Airport. In a trial from Dec. 4, 2007 to March 23, 2008, United Airlines, Air New Zealand and Japan Airlines completed 57 flights into the airport using a continuous descent approach. The result, Boeing said, was a reduction in fuel consumption during descents by up to 39 percent, depending on airplane type, and total carbon emissions by more than 500,000 pounds. "Concepts like Tailored Arrivals potentially can be deployed quickly and at relatively low cost because the technology is in place today," said Kevin Brown, Boeing vice president and general manager of Air Traffic Management. The airlines involved in the San Francisco flights used Boeing 777-200ER and 747-400 airplanes. On average, full Tailored Arrival approaches reduced fuel consumption of the 777s by 1,303 pounds per flight, or about 34 percent. For the 747s, the savings was 2,291 pounds, or about 39 percent. Even partial use of the Tailored Arrivals approach, which occurred on 119 additional flights, produced fuel savings of 379 pounds per flight for the 777s and 1,100 pounds per flight for the 747s.