my question was to Meto about the differences between the navigation systems on DL's 737s and 757s.... Instead I got a whole lot of responses from others that didn't add one iota to what Meto wrote.
With all due respect, it is precisely issues like this where I will defer in a moment to a professional aviator who has been all over the world on numerous aircraft for longer than some of the participants on this thread have even been alive regarding questions such as what impact the selection of a 757 has vs. a 737.
He also didn't try to get into the demand question because I think he recognizes that there are people at the GO who are smart enough to decide what plane is best suited for the route from that perspective.
but I will give you this... if the choice to use a 757 was because it would increase DL's reliability (whether it is because of available and closer crews, better navigation, or because of any number of OPERATIONAL reasons, DL's operational reliability is precisely part of why DL is winning over so much corporate business.
When DL can go to corporate clients and show that DL runs a consistently better operation than other carriers and still offer the same price on the same, if not smaller network (remember DL is smaller than AA/US and UA at the moment), business travelers esp. want a reliable airline that provides solid levels of service.
AS is no pansy in the operational or customer service dept. Perhaps the reason why DL is in a position to grow in SEA now is precisely because it has the operational reliability that not only gives DL the network size that far overshadows AS but also puts them far closer to if not on par with AS if you consider that AS has few operations on the delay-prone east coast.
others are noticing how well DL's operations are running and how that is essential to being chosen by businesses for their travel needs.
http://www.fool.com/investing/general/2014/04/13/1-key-area-where-delta-air-lines-inc-trounces-the.aspx
"Solid operational performance is worth a lot"
"Delta's higher reliability should have a big long-term reward, as profitable high-fare business travelers expect good service. If Delta can maintain its sizable advantage, it should gradually gain market share among business travelers. (Of course, business travelers also consider things like flight schedules in choosing between airlines.)
"However, solid operational performance can also lead to big short-term rewards. Delta Air Lines handled last quarter's winter storms very well, which will allow it to post a 6.5%-7.5% operating margin -- in line with its original guidance.
"United Airlines' weaker operational performance hurt its Q1 earnings. Source: The Motley Fool
Its less-reliable competitors weren't so lucky. American Airlines had to revise its Q1 operating margin guidance down by 1 percentage point, to a new range of 5%-7%. United Continental is in even worse shape for Q1 -- after initially projecting a 0%-2% increase in unit revenue, the company now expects a 1.5%-2.5% decline. That will lead to an even bigger Q1 loss than last year."