A flight from JFK Airport to Seattle was grounded for hours and then forced to head back to the terminal Monday night after a passenger revealed they may have been exposed to the coronavirus, officials said.

Delta Airlines flight 2503 returned to the terminal “after a customer shared they may have been previously exposed to coronavirus and our aviation medical consultants recommended the customer be evaluated,” a spokeswoman said.

A Twitter user who said they were on the plane wrote around 7 p.m. that “Someone on our flight got notified they were exposed to someone with corona before we could take off and now our plane is heading back to the gate.”

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“We’re just sitting on this plane waiting for them to decide wtf to do,” Ifrah F. Ahmed wrote a couple of minutes later.

“All breathing this recycled plane air :(”

The plane was scheduled to take off at 6:30 p.m. At around 8:45 p.m., the witness tweeted that “They’re cleaning our plane and we’re back inside the airport at a different gate.”

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The passengers appeared to be put on a new flight to Seattle, which took off around 10 p.m., according to flightaware.com

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“We continue to follow all guidelines from the CDC and local health officials and the aircraft is in the process of being cleaned,” Delta spokeswoman Kate Modolo said in a statement.