perhaps you believe that I am saying the route wont' work.. that is not what I am saying. SLC is a big enough market, the 319 is a relatively small plane (I think that is what US is using, right?) and there clearly are people who will arrive late at night to ski, even if the majority of people arrive at ski destinations earlier in the day. SLC and DEN both are both near ski destinations but they are also large markets than have other characteristics.
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I do think you have to factor in, though, that SLC is a medium hub at best and DL serves it quite well from the east, including from ATL, CVG, DTW, and MSP, all hubs that have plenty of "reach" into the east coast markets where US is also strong. There will be passengers that US will attract but DL's ability to carry traffic from the eastern US to SLC either on nonstops or via its hubs is far greater than any other airline. You need only look at DL's presence from cities as large as ORD to SLC where DL has a disproportionate amount of the service to SLC despite it being AA and UA's hub.
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I'm not saying US can't make it, but they will be far more likely to pick up incremental, lower yielding traffic than they will higher value business traffic which demands the schedule flexibility that comes from a larger carrier in their own hub.
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remember also that DL and US have had long-standing "discounting efforts" in each others' hubs which surprisingly have decreased while the slot deal has worked its way through.
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I expect more of a return to business as usual between the two carriers.
and btw, Jim, a redeye return from a ski destination can be quite popular with some people because they can ski all day, head to the airport, and save a day of hotel expenses... it cuts both wans.