Thanks for the replies.

Will not do it as I already have a ticket back home tonight, not worth risking not getting on the Delta flight. Was more curious about if it would actually work, especially when I could check in and get a boarding pass. For those screaming fraud, it isn't like I forced Delta to make this mistake. As if those people never have had a mistake happen that works out in their favor.

It is an out and back LAX-LAS trip that I did yesterday and need to do today also.