Southwest and AirTran Jet Blue are known for your discount flights and their convenient routes. While these carriers themselves as big League have distinguished discount store, you no longer are flight the automatic choice for cheap.
Why, questions you?
Now, the traditional airlines (USAirways, United, Delta and the like) have been have lately the fat trim and are now some awesome rates Entformen.Da again reinforced old players, it is best that to shop and keep the eyes and ears wide constantly open.
Keep in mind that routes each airlines have speciality (niche).