Speaking of being able to "grasp" things, the issue isn't that someone won't get a seat assignment, but rather that they'll get one they don't like/isn't by the rest of their party/etc. They'll try to move anyway, and that's when the fun'll start.
The issue seems to be that the assumption is that some people can't figure out how to survive with things that are not everything they want.... the reality is that LOTS of people have had seat assigments in less than ideal locations on the plane and at times separated from family.
FAs and gate agents have plenty of experience in handling those types of situations...
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The concept is that DL is offering a product that DOES NOT offer seat assignments until check-in and they make that fact very clear during the purchase process.
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This is a test... and if the test were being offered in your city, you could probably throw your 2 cents worth in... I'm quite sure DL is asking the employees involved their perspective on the passengers - and probably asking some of the passengers as well because that is what good market testing does.
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The fact that DL added functionality to delta.com to handle economy basic indicates it wasn't a flash in the pants decision - yet it is still in test.
If you are aware of specific information that can provide insight into how the test is working, I'm sure they want to know.
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What remains true is that DL is thinking about lots of possibilities regarding its services... it clearly won't get every product or service right but continuing to believe that what is offered today is good for everyone and can't be improved upon is a recipe for financial disaster.
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The airline industry is rapidly changing... you can either lead and stay ahead of the changes or be run over by them.
It would appear that DL is trying to ensure it remains not only competitive but able to grow its revenues... its financials of late indicating it is doing a pretty good job in that regard.