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If the United Parcel Service Inc. forecast is correct, Tuesday should be the busiest day of the year for Jill Schubert and the 15,205 UPS employees she supervises from its regional headquarters in South Philadelphia.

Shipping volume is already up from 2012 and Tuesday is peak day with 29 million packages expected to be delivered globally, up from 27.5 million last year.

“It’s controlled madness or controlled chaos,” said Schubert, 51, president of operations. “But the key is that it’s controlled.”

NBC’s Janet Shamlian reports from inside one of the 60,000 UPS trucks out and about today on the busiest delivery day of the year, due in part to an increase in online shopping for the holidays.

The UPS Worldport in Louisville, Ky., is the center of the company’s international shipping operations. It’s the size of 90 football fields, sorts 350,000 packages an hour and contributes 20,000 jobs to the local economy. We took a peek inside their busiest shift: 11p.m. to 3a.m. a week before Christmas.

Monday marks the highest global pickup day for UPS with some 34 million packages to be picked up across the world — double the normal volume. Nearly 29 million of those packages will be delivered on Tuesday. Overall, The company expects to deliver more than 129 million packages the week before Christmas, said Dan McMackin, a UPS spokesman. “During this busiest time, we will be delivering about 300 packages per second,” he said.

At Worldport, a $2 billion automated processing facility that’s roughly the size of 90 football fields (5.2 million square feet), they call these days “the playoffs.” They call Dec. 23 — UPS peak air delivery day — the Superbowl.

“We prepare for peak season all year long; we have to be ready for anything,” “It’s organized chaos, but it’s fun. This time of year, many of us run on pure adrenaline.”said Amy Sitterly, the operations manager of Worldport, which has 70 aircraft docks and 155 miles of conveyor belts capable of sorting 416,000 packages per hour from 220 countries across the globe.

United Parcel Service Inc, the world’s largest package delivery company by revenue, is looking to keep an upper hand in the Chinese market by adding 14 inner-city express services next year.

UPS began domestic courier services in 2012, when it was granted seven licenses by the State Post Bureau of China. With more goods circulating in the world’s most populous market, it expanded to 19 first- and second-tier cities this year and expects to reach 33 cities in 2014.

Scott Davis, chief executive officer of UPS, said that China’s middle class will grow significantly over the next 20 years and more delivery services will be needed, so the company wants to expand its network in the country.