Agree EZY is cherry picking. They are point to point, SW and AirTran are hub models mostly.
Cherry picking can be successful but is limited. As you grow your customer base, they will want to go more places. I would submit SW has outgrown the cherry pick model. As this happens, your next customer comes from a major, and you need to convince them that your lower prices offset the value/cost of a more limited network and fewer departures.