Easily one of the most controversial publicly traded enterprises in recent memory is aerospace juggernaut Boeing Co. BA. Though an icon of industry, a series of misfires and tragedies have weighed heavily on its credibility. At the same time, management is looking to turn a new page, and there's strong evidence of a turnaround. Still, lingering questions fuel arguments for both sides of the table.On the optimistic front, Boeing recently sent a shot across the bow, affirming to shareholders and competitors a ...