The family of Oscar Munoz, the CEO of United Airlines, said that he was admitted to a hospital on Thursday, according to a press release issued by United Airlines.
The airline said that they will still continue to operate normally despite the absence of their CEO.
United Airlines didn't elaborate further on Munoz's condition in the press release, saying that "we will provide further details as appropriate."
A person familiar with the matter told Reuters that the reason Munoz was rushed to the hospital was due to a heart attack.
The person adds that the board was promptly informed after Munoz was taken to the hospital.
The person also told Reuters that a meeting between the United Airline's board members is not needed.
"There's no reason for the board to meet," the person said. "We're still gathering information about his medical condition and prognosis."
The New York Times adds that Munoz, who is 56-years old, was named as CEO of United Airlines last month.
His appointment followed the surprise dismissal of United Airlines former CEO Jeff Smisek during a corruption investigation.
The New York Times adds that Munoz traveled extensively during his first month as CEO of United Airlines.
He was travelling in around United's hubs to speak to employees and pledge a change in direction.
Reuters adds that United Airlines has been plagued by complaints and employees in recent years.
Many have related the struggle with the merger of the operations of both United Airlines and Continental Airlines.
Reuters adds that Munoz made tackling those problems his top priority.
The New York Times adds that Munoz's arrival was welcomed by United Airline's unions and hoped he could help improve relations.
Analysts said that the airline has already advanced its contract talks with pilots.
Reuters adds that Munoz was scheduled to have a labor summit with union leaders on Thursday.
Mike Klemm, head of the local branch of the International Association of Machinists, told Reuters that he was informed about the postponement midday Thursday.
"They told us he had a personal emergency," he said. "We wish Mr. Munoz a speedy recovery and look forward to getting back to work with him."
