UPS warns that some deliveries are delayed

Julia Horowitz

(CNN Money) -- UPS is a little behind schedule after last week's surge in online orders.

The delivery company said Tuesday that a small percentage of packages are being delivered one to two days late as the company works to clear a Cyber Week backlog. UPS spokesman Steve Gaut said delivery should be back on track by the end of the day Wednesday.

The company said it still expects most packages shipped between Thanksgiving and Christmas to arrive on time.

"We have resolved the situation that created the delays," Gaut told CNNMoney.

The holidays are always a frenzied period for delivery companies. But the growing popularity of online shopping has made for more packages to process and deliver.

This year's Cyber Monday was the largest online shopping day ever. A record $6.59 billion was spent online overall, according to Adobe Analytics data.

Related: Holiday hiring is getting more difficult for retailers

UPS predicts that it will deliver 750 million packages between Thanksgiving and Christmas. That's up 5% from last year, when UPS delivered 712 million packages.

The seasonal challenges have been compounded by the fact the improving economy has made it more difficult -- and expensive -- to find seasonal help.

This year, UPS brought on 95,000 seasonal workers for the holidays. It added the same number of people in 2015 and 2016.

And as usual, the company has leased additional planes and rented more trucks to manage the high volume, and has assigned more workers to office locations that are typically swamped.

"We are taking all necessary steps to ensure we are serving our customers' demand, especially during this holiday period," Gaut said.

Additionally, UPS has told more than 100 package delivery centers in areas with high demand that drivers may be asked to work extra hours through January 5 -- up to 70 hours over eight days.

The Teamsters union, which represents 250,000 UPS employees, isn't happy with that plan. James Hoffa, the Teamsters' general president, said in a letter to UPS CEO David Abney on Monday that the move will take a "physical toll" on workers, and hinders their ability to spend time with family over the holidays.

UPS and the union are currently in the middle of contract negotiations.

-- CNNMoney's Chris Isidore and Kaya Yurieff contributed to this report.

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