In this Thursday, May 9, 2013, photo, a Southwest airline taxis by parked Allegiant Air jetliners at McCarran International Airport in Las Vegas. While other U.S. airlines have struggle

 

              In this Thursday, May 9, 2013, photo, a Southwest airline taxis by parked Allegiant Air jetliners at McCarran International Airport in Las Vegas. While other U.S. airlines have struggle
In this Thursday, May 9, 2013, photo, a Southwest airline taxis by parked Allegiant Air jetliners at McCarran International Airport in Las Vegas. While other U.S. airlines have struggled with the ups and downs of the economy and oil prices, tiny Allegiant Air has been profitable for 10 straight years. (AP Photo/David Becker)