United Airlines chairman and chief executive Jeff Smisek and two other senior officials have resigned amid a federal corruption probe, the company said Tuesday, a major shake-up at the top of one of America's largest airlines.<br />The resignations were linked to an investigation exploring whether the air carrier launched a money-losing flight from Newark to Columbia, S.C., to benefit the influential then-chairman of the Port Authority of New York and New Jersey, who owned a vacation home near Columbia.<br />The company said Tuesday that it is cooperating with that ongoing investigation and is conducting its own investigation.<br />The U.S. attorney's office in New Jersey declined to comment Tuesday.
