United is the only airline which will have strong low-fare competition at all its hub cities. Virgin US announced that SFO would be the main base of operations. at IAD Independence Air has announced a vast array of flights to same cities served by UAL. Of course there is Frontier which is expanding at Denver. Although O'Hare does not yet have much low-fare airline service, UA must share the market with AA and, more importantly, convenient MDW probably has low-cost airline service to more cities than any other airport in the world.
UAL must envy Northwest with only a handful of low-fare flights from MSP, DTW (I thought LUV would have at least offered DTW-BWI service by now) and Memphis; AA with no low-fare competition at DFW; Continental competing against low-cost airline flights to only a handful of cities at EWR and CLE; DAL with no low-fare competition in Cincinnati and only modest LUV competition in SLC.
UAL must envy Northwest with only a handful of low-fare flights from MSP, DTW (I thought LUV would have at least offered DTW-BWI service by now) and Memphis; AA with no low-fare competition at DFW; Continental competing against low-cost airline flights to only a handful of cities at EWR and CLE; DAL with no low-fare competition in Cincinnati and only modest LUV competition in SLC.