I had heard of this elsewhere, and dismissed it as unlikely to occur, but there is indeed an anti-abortion aerial banner ("This is Roe v Wade", next to a very hard-to-see picture which might be an ultrasound or a photo of a fetus). I spotted this at the day-before-Labor-Day fireworks festivities in Cincinnati, OH,  an event that draws about 300,000 visitors in good weather. Here's a webpage of the probable originator of the banner: http://www.abortionno.org/CBRMidwest/0606.html

In my opinion, this was not exactly the most effective advert, but then again I was on a hill about 1.5 miles from the center of the venue.