Later, he tweeted that a person who said he was sitting next to Christie in first-class told him that Christie wasn't threatened but saw "a guy taking pics of crew & emailing them in Arabic."
But in a statement, Christie spokeswoman Maria Comella denied that the incident was related to a threat directed at Christie.
"Governor Christie, an aide and a member of his security detail were traveling on a United flight from San Francisco to Boston this morning when a passenger was removed from the plane before takeoff at the request of United Airlines," Comella said. "At no point did Governor Christie interact with this passenger nor did this passenger pose a verbal or physical threat to the Governor."
In a statement, the airline confirmed that the San Francisco flight to Boston was delayed due to a "disruptive customer."
“United Airlines is working to accommodate customers of flight 1108 to Boston after the flight was delayed in San Francisco due to a disruptive customer on board," United said in a statement. "The flight will depart this afternoon.”