American Airlines investigating after employee-passenger confrontation on flight to Dallas

American Airlines is investigating after a video surfaced showing an airline employee challenging a passenger to hit him.The video of the confrontation, filmed by another passenger Friday during boarding of a flight from San Francisco to Dallas, comes just two weeks after a video of a bloodied United Airlines passenger being dragged off a plane by Chicago aviation police.The confrontation involving the Fort Worth-based American (Nasdaq: AAL) flight shows an airline employee challenging a passeng