Delta Air Lines, Inc. reported operating results for the quarter ended December 2014. The company's operating revenue improved 6%, or USD 571 million, in the December 2014 quarter compared to the December 2013 quarter. Traffic increased 4.0% on a 3.7% increase in capacity.

Passenger revenue increased 4.6%, or USD 361 million, compared to the prior year period. Passenger unit revenue (PRASM) increased 0.8% year over year with a 0.6% improvement in yield. Cargo revenue increased 2.1%, or USD 5 million, driven by increases in both freight volumes and yields.

Other revenue increased 21.3%, or USD 205 million, driven by SkyMiles revenues, third-party refinery sales, and joint venture settlements.