UPS really, really dreaming of white Christmas - Reuters The snowstorm that walloped the East Coast over the weekend hit retailers hard, forcing store closures and keeping shoppers at home by the fire. But those heavy storm clouds had a silver lining for shippers like United Parcel Service, the world’s largest package delivery company, whose business peaks annually with the global gift-giving frenzy that culminates around Christmastime. On Monday, UPS’ busiest day of the year, the company delivered 22 million packages. Wednesday it will deliver 6 million more by air. To be sure, the weekend’s weather made driving and flying more difficult UPS’ drivers and pilots. But as they cool their heels back at the hubs, waiting out the weather, they knew the work would be there for them when the skies cleared.