as the search for airasia flight 8501 has unfolded what questions are on your mind and you've been answering us with your questions. joining to us give you some answers is cnn aviation analyst les abend. he's a 777 captain and christianitying editor to "flying" magazine. this viewer asks can you ask why the black box doesn't have a floatation device attached to it. >> the military has something. the technology is already there. why don't we already have it is perhaps cost. because you have to weigh the benefit of this this is what we call tomb stone technology. this is after the fact. what now -- let's prevent the accident from happening rather than determining why it happened in the first place. but it's not a bad suggestion. this has come up before.