I guess you could argue putting stickers on the chart clip is out of sight if you had a chart on it. You may not see it where you fly but they make these maintenance guys come in an clean off the graffiti from the chart clip. Some maintenance guy overseas is going to find a repetitive check tag under the 10-9 that the last guy left on the clip and not understand it. I don't think it's any better than the DPA stickers at the old T3 lounge that got stuck on the glass door and the ALPA TV. That funny DPA bag with the kryptonite bicycle lock was probably ok.