Kenneth "Ken" Chenault, chairman and chief executive officer of American Express Co., speaks during an Economic Club of Washington luncheon in Washington, D.C., U.S., on Monday, April 15, 2013. American Express, the biggest U.S. credit-card issuer by purchases, said last month the Federal Reserve approved a revised plan to increase its dividend by 15 percent and repurchase shares. Photographer: Andrew Harrer/Bloomberg via Getty Images