I'm personal friends with an FO(soon to be Captain) who flies for SWA, and from what he says, you simply just need to be in a relaxed frame of mind during the inteviewing process, but still alert enough to prove that you know what you're talking about. Hope that makes a little bit of sense. Their whole culture is simply something to be admired.
Just migrating away from the subject, are you from Dominica or the Dominican Republic? Reason I'm asking is because I'm from Dominica myself but also in the US at the moment. Anyway, all the best!!!!