WIA is waaayyy worth it, no matter your gender or race. The same recruiters are there that are at the Air Inc. job fairs, and there are definitely no lines. At the last WIA job fair I spent several long detailed conversations over a two day period talking with the Jetblue recruiters, which is what got me started down the path of coming to Jetblue. At the Air Inc. conventions I hear you get maybe 30 seconds to a minute with each recruiter.
There were many guys who were brave enough to show up at the WIA convention and they got just as much "face time" with the recruiters as the gals, and certainly far more than anyone gets at an Air Inc. job fair. While attending a job fair isn't really going to give you a leg up in the Jetblue process (its all an online application), it will give you an opportunity to ask questions about the process and see where you stand.
I think some of the other airlines do offer interviews and/or preference if you have attended a job fair, so it does make it a wise investment.
Skirt