If you fly, you’ve seen the SkyMall catalog in the seat-back pocket in front of you. It’s been a great business model, marketing to a captive audience that may have nothing better to do for hours than watch the in-flight entertainment and read the seat-pocket reading material.

Of course a lot has changed since SkyMall came into being a quarter-century ago. Catalogs are getting thinner, and though paper catalogs aren’t going away just yet, less are printed every year. Due in part to reduced mail volumes, the United States Postal Service is losing money, and is slowing service while raising rates.