A boom in online shopping during the pandemic pushed revenue higher at United Parcel Service Inc., which reported a $1.77 billion profit for the second quarter.

UPS said Thursday that shipping volume jumped 23% to more than 21 million packages a day. Crucially, shipments from businesses to U.S. consumers soared 65%.

"Our results were better than we expected, driven in part by the changes in demand that emerged from the pandemic, including a surge in residential volume, COVID-19 related healthcare shipments and strong outbound demand from Asia," said new CEO Carol Tomé,

With thousands of retail stores ordered closed for safety reasons this spring, and some shoppers still wary of returning, consumers are going online to buy items they once carried out of a store, meaning more business for delivery companies.

UPS may also be benefiting after retailer Amazon.com, another company doing heavy volume in the pandemic, cut ties with rival FedEx Corp. last year.

But while stay-at-home orders and other restrictions to slow the spread of the new coronavirus have meant more business for the delivery companies, it has also strained their networks and threatened to drive up costs. Unlike their traditional deliveries to businesses, UPS and FedEx are seeing more residential deliveries, which are more spread out and more costly.

The companies have responded by imposing the kind of surcharges more commonly associated with Christmas to cover their increased spending. They have raised prices on bulky shipments and on retailers whose volumes have risen sharply during the pandemic.

Still, United Parcel's U.S. revenue per piece fell 5% in the quarter. Cowen analyst Helane Becker said this week that the growing number of quarantine measures in the United States could slow the recovery of shipments between businesses, which would be replaced by less profitable residential deliveries.

The second-quarter profit at Atlanta-based UPS was a 5% increase from the year-ago figure of $1.69 billion.

Adjusted for non-recurring costs, UPS said earnings came to $2.13 per share. That more than doubled the $1.04 per share average forecast among analysts surveyed by Zacks Investment Research.

Revenue rose more than 13%, to $20.46 billion, easily beating the $17.34 billion average forecast from the Zacks survey.

UPS shares were up 10% about a half-hour before the opening bell.

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Portions of this story were generated by Automated Insights (http://automatedinsights.com/ap) using data from Zacks Investment Research. Access a Zacks stock report on UPS at https://www.zacks.com/ap/UPS