That is absolutely the LAST piece of information this simple, Ubama-loving professor would include in his thesis.
As I told Orangehoof, Southwest is not non-union. It has one of the highest union representation amongst its airline employees. It is a myth, but an interesting myth as anti-unionists seem to cling to such confusion.
A better concern is how management is able to proactively interface with their unions (which is what Southwest is pretty good at doing).
Probably because it's false. The overwhelming majority of Southwest employees are unionized.