UPS Inc. said today it added 1.2 million square feet to its North American supply chain network by erecting buildings at three locations and expanding existing capacity at a fourth location.

In Louisville, Ky., site of the company's primary global air hub known as "Worldport," UPS has added a 606,000-square-foot facility, bringing UPS' supply chain capacity at Louisville to 4.4 million square feet. UPS built a 274,000-square-foot facility in Hebron, Ky., near Cincinnati, bringing its square footage at Hebron to 1.25 million square feet. It constructed a facility at Mira Loma, Calif., located about 5 miles from its regional air hub in Ontario, Calif., east of Los Angeles. UPS now has 1.6 million square feet at Mira Loma.

In addition, UPS added 62,000 square feet to its existing facility in Toronto, bringing it up to 2 million square feet.

Atlanta-based UPS' global supply chain network consists of 596 facilities and nearly 32.8 million total square feet, the company said.