AP

As more shoppers shift their spending online, FedEx is expecting to see a record volume of shipments over the holiday season.

FedEx estimates it will ship 280 million packages, or a 13 percent increase over last year, between Thanksgiving and Christmas.

And Dec. 10, a day that is sometimes called "Green Monday" by retailers, could shape up to be the busiest day in FedEx's history, the company said. "Green Monday" is a highly profitable day for retailers, and often kicks off the busiest online shopping day of the year.