I know it doesn't directly answer your question with regard to highs/lows, but there is some good information about the extra TSA steps that you may encounter while wearing a pod:
You should check out the omnipod group's wall. Start from page 2 with Shawn MacKay's original question and then read backwards to the front page.
To answer your question more directly though, I do notice some erroneous highs/lows but without being able to pull a pod off and watch the insulin egress/ingress the way you can with a tubed pump, I'm not really sure as to how much of those issues are caused by the pressure differences. It's reasonable to assume that "some" may be due to that. I would recommend what Mel (I'm assuming that's the blog to which you are referring) mentioned with regard to testing often, carrying glucose, talking with your physician or healthcare team about the best strategy for you, etc., since podders cannot disconnect.