Airlines" On-Time Performance Rises - NYTimes.com Rich Addicks for The New York Times Delta Air Lines employees monitor ground traffic from a tower at Hartsfield-Jackson Atlanta International Airport. ATLANTA - Next time you dawdle at the duty-free store or an airport bar, thinking you have a few more minutes until your flight is set to go, know this: the plane's doors might have already closed. A customer checking her bag. Delta installed bag check-in computers on boarding ramps. There is a lot to complain about in air travel, particularly during the holiday season, with seats and overhead bins filled to capacity and the airlines charging fees for everything from a few inches of extra leg room to a bite to eat. But there is a nugget of good news. The number of flights leaving, and arriving, on time has improved significantly in recent years. That is partly the result of the airlines flying fewer flights. But it is also because some airlines are focusing more on getting their planes out of the gate on schedule. "There has been a lot of focus on improving performance across the industry," said Peter McDonald, United's chief operations officer. With carry-on space at a premium, he said passengers are also eager to board early. There's not a lot of hanging out at the bar until the last minute anymore. John Fechushak, Delta Air Lines" director of operations in Atlanta, compared the daily task to "putting together a puzzle with different pieces every day." Here is a sampling of what Delta, for instance, looks at each day for each flight. How many minutes did it take for a plane to reach its gate after landing? Was the cabin door opened within three minutes? How soon were bags loaded in the hold? Did boarding start 35 minutes before takeoff? Were the cabin doors closed three minutes ahead of schedule? So far this year, 83 percent of all flights took off within 15 minutes of schedule, the highest level since 2003, according to the Department of Transportation, which compiled figures through September. But that average belies a wide range of airline performances. Hawaiian Airlines, helped by good weather for much of the year, topped the rankings, with 95 percent of flights leaving on time. At US Airways, 89 percent of departures were on time in that period, while Delta had 87 percent. The biggest laggard this year has been United, which is struggling with its merger with Continental Airlines. The carrier has had three major computer problems this year, including two that crashed the airline's passenger reservation system, stranding thousands of travelers and causing significant delays and cancellations. Its on-time departure rate, as a result, was 76 percent this year, the industry's lowest. American Airlines, which is going through bankruptcy proceedings and has been dealing with contentious labor relations, has also performed poorly. It delayed or canceled hundreds of flights in recent months after pilots called in sick or reported more mechanical problems. The airline also canceled scores of flight after seats were improperly bolted on some of its planes. As a result, nearly 40 percent of American's flights were late in September. Government statistics, however, do not provide the full picture: smaller carriers, like ExpressJet and SkyWest Airlines, which operate regional flights for Delta, United and US Airways, generally have lower on-time performance than their partners. On-time statistics also vary widely by month, with the worst months in August and January, when summer storms, holiday travel or winter weather cause more disruptions. There are also single events that throw off the airlines: statistics, for instance, will be skewed for October by Hurricane Sandy, which shut down air travel through much of the East Coast and caused more than 19,000 flight cancellations. Carriers have strong incentives to get planes out on time. Airlines now operate schedules that leave little wiggle room. Airplanes typically fly to several places every day, so any delayed flights, especially early in the day, can cascade through the system like falling dominoes and bedevil flight planners all day. Airlines often have to burn more fuel to try to make up for lost time, or make new arrangements for passengers who miss connections. Airlines have long padded flight times to make up for congestion at airports or delays caused by air traffic controllers. Even so, passengers still expect their flight to take off and land at the time printed on their ticket.