That’s just some of the data we uncovered researching on-time percentages from September 1, 2007, to August 31, 2008. Mining that data, we put together a list of the best and worst airlines for delays. This list has changed quite a bit from 2007, even more so than our list of the Best and Worst Airports—there are newcomers in both categories, and some airlines have changed dramatically. How come?

While there are industry-wide efforts to improve on-time performance, perhaps more effective are the steps that individual airlines are taking. US Airways, which had the lowest on-time performance in 2007, with just 68 percent of domestic flights taking off on schedule, began offering its employees bonuses for improving conditions. In 2008, its punctuality record ranked near the top. And the worst offender, American Airlines (running last during the first eight months of 2008), is also changing its ways. The carrier has scheduled longer periods between flights to give staff more time to prepare planes, and it’s building up its spare-parts inventory so that repairs can be made more quickly.

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