I had a similar problem, but fortunately didn't go to a job fair, so I don't believe my app was scored.
If you know anyone at Delta you could look into getting the HR email sent in from them. That may get your app pulled out and reviewed. You could also go to another job fair and admit to your error and ask for another shot.
My feeling from lurking on this forum is that no one knows for sure how situations like this are handled.
The general consensus is that apps need to be perfect for Delta to send an invitation.