Online retailer Amazon.com Inc on Friday reported its best holiday sales season yet, even as sales and traffic at U.S. store chains were the weakest in decades, sending its shares up nearly 4 percent.

Analysts have pointed to Amazon as a rare bright spot in this year’s holiday shopping season due to its scale and flexibility, as retailers try to outdo each other with deep discounts to lure consumers during a recession.

Online sales were also helped by winter storms that hit large sections of the United States on the last major shopping weekend before Christmas.

In a release titled “Amazon.com’s 14th holiday season is best ever,” the company said more than 6.3 million items were ordered on its site worldwide for the peak shopping day of December 15, amounting to 72.9 items ordered per second. On its peak day, it shipped more than 5.6 million units.

However, the company gave no financial details regarding the sales, such as how its margins fared with the discounts seen across the retail sector.