How do an airline's cost structure and its basic business model affect its ability to manage costs and charge competitive rates?

"To Redress Industry Blues, Delta Turns to Song," The Wall Street Journal, January 29, 2003, p. A3, Nicole Harris; "Costly Race in the Sky: Same Route, Same Plane, Yet United's Flight Costs More to Operate than JetBlue's," The Wall Street Journal, September 9, 2002, p. B1, Susan Carey. Overview Big airlines like USAirways. United, and Delta struggle to compete with smaller carriers like JetBlue. Delta answers by introducing its own low-fare airline, Song.