Understand what they were thinking, what they were experiencing. >> reporter: a lot of people have talked about the cultural differences in flight crews and the problems that that may cause in these situations. is that something that's part of your investigation as well? >> you know, it's interesting, because there has always been conversations about multi-member flight crews and how they interact together. there's been questions about authority gradients, in different cultures and also between captains and first officers, and in fact, decades ago, that was the very genesis of crew resource ma...