I find it somewhat dissappointing that we have to get into "legalese" of what the job offer constitutes. As for myself I always thought SWA to have a higher degree of integrity regarding the treatment of its customers, employees and potential employees.
When reading the book Nuts, I remember a paragraph by Herb stating to the effect that "if we say something we do it" i.e we mean what we say. I also remember reading of a corporate culture that cements policy on a verbal agreement.
With the current state of the industry have the values of SWA changed? I hope not but this incident certainly has me wondering.
Then I guess you remeber the paragraph about hirring the right employees for the job. While its sad to see a mistake like this happen, sometimes $hit happens.