US President Barack Obama recently called several CEOs for advice on dealing with the upcoming "fiscal cliff" faced by the federal government, according to a White House official in contact with CNN. Four executives have been named, including Apple's Tim Cook, JPMorgan Chase's Jamie Dimon, Boeing's Jim McNerney, and Costco's Craig Jelinek. The calls follow meetings with other CEOs last week, including conversations with General Electric's Jeffery Immelt and American Express' Kenneth Chenault.