The outlook for the Zacks Transportation - Airline industry is bright with the air travel demand scenario appearing rosy. Declining fuel costs also bode well for airlines. This is because expenses on fuel represent a key input cost for airlines.As a result, we believe that investors interested in the industry would do well to bet on stocks like United Airlines (UAL) , American Airlines (AAL) and Alaska Air Group (ALK) for higher returns.About the Industry The Zacks Airline industry players are engaged in tr ...