Well, if you are the type who thinks that you should be given an answer on the spot, you are either not very experienced at job searching, or your overblown ego came across in the interview and the answer is no, you didn't get the job.
You've been advised in more than one thread that you have started that there are extensive background checks that have to be done before the airline can offer you a job. As the job fair was with WN, I'm guessing that you were not the only applicant.
When they have done the background checks and the recruiters have a chance to sit down and compare notes about the applicants, they will notify you about whether or not you got the job. According to them, that will be in 2-3 weeks.