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.

Union Pacific’s profits rose in the fourth quarter as volume increased 5% and operating costs fell. “Our strong fourth quarter results represent a great capstone to a very successful year for Union Pacific,