United Airlines CEO Oscar Munoz says he is going home from the hospital nine days after a heart transplant.

In a letter to employees that United released Friday, Munoz said his doctors have been impressed with his progress and expect a quick recovery.

Munoz said he expects to take part in key meetings and strategic planning.

Munoz had the surgery Jan. 6 at Northwestern Memorial Hospital in Chicago. He had been on medical leave since suffering a heart attack in October just six weeks after replacing Jeff Smisek as CEO.

United has said Munoz, who is 57, is expected to return to work late in the first quarter or early in the second quarter.

Chicago-based United Continental Holdings Inc. is the nation’s third-biggest airline by traffic, trailing American and Delta.

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