Despite weather-related delays that rippled through the U.S. air traffic system in December, airlines operated more flights on time for all of 2008 than they did in 2007, according to the Transportation Department. The 19 largest U.S. carriers brought in 76% of their flights on time last year, compared with 73.4% a year earlier. Flight cancellation, baggage handling and denied boarding numbers also improved year-on-year, and customer complaints plunged nearly 20%.

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