difficult and it doesn't always go as you expect. >> there's also the question of how much information -- i mean do you give each little piece of information to a family member. smoke is spotted on an island according to a helicopter crew who sees it is reporting to local media, is that information that you immediately give to the families or do you wait to verify it? >> there are very few incidents where you don't have the plane, where you're spending days searching for them. they crash on land and you've got the wreckage. but there aren't that many where you don't have the plane and you're in this vacuum of information. >> how significant is the fact that this airasia flight was flying at the lowest altitude of all the other planes that were in the region? >> just probably haven't learned about the information, what's ahead of it. how do you know if it's ahead of you is if the previous aircraft went through that area reported it. >> that's how you know? there's not radar equipment? >> there's radar equipment, but that doesn't necessarily tell