UPS posts earnings of $1.57 a share vs $1.42 expected

Analysts expected the company to report earnings per share of $1.42 on revenue of $16.28 billion, according to a Thomson Reuters consensus estimate. UPS CEO David Abney told CNBC's " Squawk on the Street" on Dec. 29 that he is "very comfortable" with his company's relationship with Amazon. —CNBC's Tom DiChristopher and Reuters contributed to this report..