United Continental Holdings Inc. Chief Executive Officer Oscar Munoz is preparing to return to the airline once he recovers from the heart attack he suffered a month after he joined the carrier.

“Based upon discussion with my doctors I will be back in the first quarter,” Munoz said Thursday in a letter to employees. He took a medical leave in October.

Munoz’s comeback will cap a tumultuous period at the world’s second-biggest airline triggered by the surprise ouster of CEO Jeff Smisek in September. Already a United director, Munoz was hired away immediately from railroad CSX Corp. and vowed to focus on labor peace — only to be stricken barely five weeks later as he prepared for a union summit.

This article was written by Michael Sasso from Bloomberg and was legally licensed through the NewsCred publisher network.

Photo Credit: CEO Munoz in a promotional video. United Airlines