One of the reasons for that could be methodology. Because they keep low cost separate from the "traditional" carriers, it is hard to tell the true picture. It is perfectly possible that if combined, the top 5 low costs could occupy the top of the combined table. The division between traditional and low cost is no longer relevant. The experience of people flying say JetBlue or Virgin America compared to those flying US Airways or Delta would I am sure be far superior.
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