Week’s roundup of quarterly reports includes American Airlines, the city’s second-biggest carrier, and Union Pacific, the biggest of the major rail operators.

Union Pacific on Thursday posted a better-than-expected profit for the fourth quarter helped by improving volumes and robust pricing, which was partially offset by lower fuel surcharge and less profitable cargo mix.

Shares of Union Pacific were gaining after the railroad easily beat quarterly earnings estimates, but missed on the top line. Union Pacific stock rose 5% to $247.50 in early trading Thursday. For its fourth quarter,