NEW YORK (AP) - United Airlines CEO Oscar Munoz says he plans to return to work sometime in the first quarter of 2016.

NEW YORK (AP) United Airlines CEO Oscar Munoz says he plans to return to work sometime in the first quarter of 2016.

Munoz, 56, has been out on medical following an Oct. 15 heart attack. The company's general counsel, Brett J. Hart, has led the company in his absence.

Munoz had spent a month leading the Chicago-based United Continental Holdings before having the heart attack. He became CEO on Sept. 8 after Jeff Smisek was pushed out amid a federal investigation into the airline's dealings with the government agency running one of its most important airports.

During his short tenure, Munoz made a big announcement acknowledging that United had failed its passengers with chronic delays and computer outages and that it had poor relations with its workers. He promised to fix both.