On Delta and other legacy carriers, add-ons like sitting closer to the front of the cabin or aisle seats are considered premiums. | Shelby Knowles/Bloomberg via Getty Images Perhaps it’s the natural human inclination toward nosiness, but people are always interested in what others are and aren’t buying. Those purchases always invite some kind of judgment, comparison, envy, desire to stay on trend, or some combination of all of the above. What people buy is often a reflection of a bigger picture about how we live and the things we find important.  And one thing that Americans really bu...

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