By Daniel Kline If you’re not a customer of the discount airline, maybe you should consider becoming one because it keeps making moves based on customer happiness. Most airlines treat passengers as baggage, Yes, the plane has to be full in order for the company to make money, but aside from making sure you get onboard, everything else is pretty irrelevant. The big airlines, of course, don’t ever say this — just like your cable company won’t tell you it doesn’t care if your service is out — but they view passengers as a necessary evil. That gets proved every time you look at all the added fee…