UPS expects to deliver 527 million packages between U.S. Thanksgiving and Christmas this year, surpassing last year's record high by 10 per cent. The world's largest package delivery company estimates 28 million of those will be delivered on Dec. 20, projected to be the busiest day of the year. That's nearly double what the company moves on an average day. UPS plans to hire 55,000 seasonal workers to sort, load and deliver packages.