USPS did record-breaking work over the holidays, but was plagued by late deliveries
"The U.S. Postal Service released holiday numbers showing a new record with the handling of 13.7 billion packages and letters in the period between Thanksgiving and New Year’s Day, including 7 million strong in the state of Utah. But the triumph is tempered by a slump for on-time deliveries during peak weeks in December, underscoring the agency’s room for improvement despite heroic efforts by a dogged mail carrier workforce."