This is one of the oddest threads that I have read on FT. After four pages, I'm still trying to figure out why switching seats mid-flight is a problem. The passengers have one seat in coach and one in front. After they switch, the passengers have one seat in coach and one in front. It all seems pretty straightforward to me. As for the argument about the "integrity of first class," it doesn't appear to me that the passengers took anything that didn't belong to them. Sorry, maybe I'm just dense, but I don't understand the reasoning behind any of this being a problem.

On the plus side, we've gone four pages without somebody using that great catch phrase, "It's for your security."

Mike