Well- I would follow Delta! Remember when they first started out they just said "we want to be a small airline", and they never had any plans to expand.
And now look, they're like one of the biggest major U.S. airlines!
You can search google or go to Delta's website, http://www.delta.com
, and they will probobly have a "history" part of their site, which explains how their whole airline got started.