This article would have been strengthen by dissecting the Washington, DC market as it did the LAX market.

US Airways and American are a minority in the DC market and only operate 25% of flights between IAD/BWI/DCA. Airways also only 69% of DCA flights while SWA has 74% of BWI flights. UAL is 70% of IAD.

Meanwhile UAL is 75% of EWR and DAL is 72% of ATL... I don't get it.