Pretty much both are at fault.
I would put more responsibility on the Delta employee though. I doubt the employee didn't know who AW was...meaning that when he was recording there's a chance the video would end up online. Once he walked into that washroom cubicle, both the uniform and ID should've been off. In fact before entering the ID should've been pocketed away. He clearly knew he was being recorded but was saying otherwise hoping it would save him his job.
He may not have known the video was going online, and if thats true then AW is totally at fault. Could also be the possibility he knew the video was going online but didn't think it would get back to his job and is only denying that to again save his job. At the end of the day, the Delta employee wasn't thinking at all when he hooked up with AW and is paying the price. No sympathy.
Makes sense. And because he's a stud I'm sure in most cases the guys agree.