United Continental Holdings Inc’s  new chief executive officer has suffered a heart attack, a person familiar with the matter said on Friday, barely a month after he took on the job of improving the airline’s profitability and reputation.

The board at United – the No. 2 U.S. carrier by capacity – was informed “promptly” after Oscar Munoz was taken to hospital, the person said.

“There’s no reason for the board to meet,” the person said. “We’re still gathering information about his medical condition and prognosis.”

United’s previous chief executive left while federal authorities were conducting an investigation involving the Port Authority of New York and New Jersey.

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Munoz was the number two executive of CSX when he left in September to pursue a career as CEO of United Airlines.