This isn't banner ads extending down over posts. It's a banner ad over a comment, about three or four down. Not over my comment. Twice today. I wouldn't be reporting it, but it's neither temporary (spontaneously evaporating) nor closeable. It's for the Chase Sapphire card, if that matters. Here's an example (maybe) but it's probably not transferrable...

http://www.flyertalk.com/forum/hyatt...ame-night.html

Thanks.