The Zacks Transportation - Airline industry is being driven by upbeat air travel demand. Moreover, efforts to reward shareholders by the industry players indicate financial strength. However, high labor and fuel costs represent major headwinds. Moreover, production delays at Boeing (BA) are hurting the fleet-related plans of airlines in the United States. Despite the headwinds, we believe that investors interested in the industry would do well to keep stocks like United Airlines (UAL) , Alaska Air Group (AL ...