we have to remove our shoes at the airports now. we're talking about reinforced cockpit doors after 9/11. what is the next change, richard? >> the next change is not some blanket you can't do this, you can't do that. it's smart security. it's know your passenger. very much what they're doing here in the united states with the tsa, precheck. know who is -- know who the passenger is and who you need to be concerned about. and that's not profiling per se, but it is ensuring that you don't worry about certain people so that you can focus your attention on other people. it's very difficult to do. but it's the allow theory. it means you don't waste time searching 75-year-old grandmothers. >> mary, what about also that the information that is important to figure out what happened and how to improve the next one from happening doesn't end up in a debris field? >> well, that's very important. in fact, you know, the