American Airlines Group Inc. posted a fourth-quarter net loss of $1.9 billion when combining results from pre-existing American Airlines and new subsidiary US Airways Group.

The two airlines officially merged on Dec. 9, 2013. After various adjustments related to the merger, AA's now-complete bankruptcy and many other items, quarterly net income was $436 million, an improvement from the $42 million loss reported for the prior-year period. For the full year, the combined entity generated $35.5 billion in total passenger revenue, up 4.7 percent from combined 2012 results and good for tops in the industry. Combined fourth-quarter performance also included a 5.3 percent year-over-year improvement in passenger yield and a 5 percent gain in passenger unit revenue. Total passenger enplanements edged up 1.9 percent. The company cited "strong demand and high load factors" during 2013. "These financial results are evidence of the strong foundation we have in place and we anticipate improving upon these results as we further integrate our operations in 2014," according to a statement from CEO Doug Parker.