MIAMI— Oscar Munoz, United Continental Holdings Chief Executive, has suffered a heart attack and is being treated at a hospital in Chicago, according to a report by Wall Street Journal.

Last September, Munoz was appointed as the CEO of the parent company of United Airlines, after the resignation of Jeff Smisek amid a federal investigation probing the link of the airline to the Port Authority of New York & New Jersey (PANYNJ), operators of Newark Liberty International Airport.

In a brief press statement, the airline informed:

We have been informed by Oscar’s family that he was admitted to the hospital on Thursday and we will provide further details as appropriate. In the meantime, we are continuing to operate normally.

Our thoughts and prayers are with his family and we are respecting their privacy.

During his first month on the job, Munoz has visited United Airlines hubs and meet with employees, besides pledging for changes in the direction for the airline, plagued with operational and financial shortcomings since its merge with Continental Airlines in 2010.

Before coming to United, Munoz served as the COO of CSX. and held finance jobs at consumer products companies including Coca-Cola , AT&T and Pepsico.