For making good use of an airport delay

Here on Biz allows you to network with other waiting passengers while you’re sitting through flight delays. Search for other business professionals who are in the airport via the popular résumé site LinkedIn, then send a connection request and take it from there. (Free, iOS only)

Duolingo is “one of the best language apps on the market”—and it’s free. So pick a language you’ve always meant to learn and “turn your delay into a personal classroom.” (iOS or Android)

Postagram uses photos from your phone, Facebook, or Instagram to create customizable postcards. When you’re finished, pay a small postage fee, and the company mails out a physical postcard. (iOS or Android)

iPinion pays users money for taking surveys. Give it 20 minutes and it’ll at least pay for a cup of coffee. (iOS or Android)
Source: Forbes.com