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Data stream in the form of a digital flight data recorder. we have nothing to visually see what is going on in the cockpit. for example in the course of an accident sequence, a pilot's hands may hover over certain instruments or radio devices, on the yolk, how he is gripping it. none of that is documented unless you have a video. on the security side, to understand what is going on in the cockpit in the midst -- i will give you an example. the regent jetblue situation about two years ago, the captain had a breakdown. the co-pilot was able to coax him out of the cockpit. he locked the door. the...

An element of deterrence because in many crashes, com-air, you can rattle off dozens the pilots were busy engaging in complaints about their airline rather than watching speed deteriorate and if they were constantly monitored they wouldn't have done it. >> i disagree. >> arthur, any legal issues pro or con? >> there are always legal issues. let's talk about practical issues here. first of all, nobody wants big brother looking at them all the time. that aside. let's look at two situations. an accident sequence and security situation. for the accident sequence we have an audio stream, we have a ...

Maybe someone did get into the cockpit. but something happened later that made, you know, the -- knocking out the crew completely and the airplane was on its own for the rest of the time. >> yeah. and we may never know. and that's why you say going forward in this article you wrote yesterday, we need to how. explain the changes you're encouraging. >> well, certainly, i think it's important that we have transponders, be they emergency transponders or whatever, that are not able to be turned off from the cockpit. so that at least in this incident and others, that data stream never would have end...

Again? >> we have enough technology in our cockpit to communicate to the -- all air photographic communication is still voice, they don't do text, they don't do data communication, number one. those to-called black boxes could be uploaded to a data station. it all has to do with cost. but look at the cost to malaysia airlines in terms of public relations and prestige and look at what will be billions of dollars spent on this recovery. going forward, it has to be an absolutely modern -- also to provide a black box that is either floatable or can be retrieved through a data stream to the ground....

If malaysian flight 370 was hijacked or if a member of the crew purposely did something to alter the path, could that have saved the plane? >> if they determined it was a problem and they tried to get in touch with the pilot and the co-pilot and they couldn't, then if that system were in place, it seems as though the ground controller could then have handed this aircraft. >> right now auto pilot systems are manually switched on and off only at the discretion of the pilots in the air. and auto pilot cannot land or take off. this potential solution could also present a new problem. >> this would...