AMR Corp., parent company of American Airlines, is evaluating the future of its American Eagle regional division, but rising fuel costs and other factors are complicating the assessment. Dan Garton, CEO of American Eagle, said last year that AMR could sell the division, spin it off or launch an initial public offering. "There is a do-nothing option," Garton said this week. "That's why it's an evaluation. We haven't said we're going to spin it off. There may be a perfectly fine solution of keeping it, while still diversifying feed" of traffic to American Airlines.