Loyalty

In 2003, Dora Costa and I published a paper on desertion and loyalty during war time.   How does an organization reward loyalty? How does it punish disloyalty?   For a data point about how NYU rewards loyalty read this.   Today, I learned how Southwest Airlines rewards loyalty.  As a frequent flyer, I was sent four coupons for free beer on their flights. I must use them before August 2013.  This isn't a binding constraint.  I must have been profiled because this is exactly what I wanted!  Big Data is clearly paying off for this company.  I'm on my way to become Premier Gold flying on United but I don't see any offers of free beer listed here.