DALLAS — As Denver International Airport embarks on the largest expansion project in its 16-year history, it’s benefitting from surging passenger levels and an improving economy that yielded a new traffic record in 2010.

With 4.2 million passengers using DIA in December, the year’s total rose to 52.2 million, an rise of 1.9% over the previous record of 51.2 million in 2008. Many other airports are experiencing similar gains.

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