Southwest Airlines' CEO James F. Parker resigns abruptly in July, citing "personal reasons," including the "draining" nature of the job. Nike CEO Phil Knight calls it quits in November, with nary an explanation for his departure (although he's staying on as chairman of the board). Coca-Cola Co. struggles to find a solid CEO nearly eight years after the death of the revered Roberto C. Goizueta. McDonald's welcomes its third CEO in just seven months, with Jim Skinner taking over late last month for Charlie Bell, who abruptly resigned to fight the colon cancer detected two weeks after Bell succeeded Jim Cantalupo, who died in April of an apparent heart attack.