that helped us narrow down the retro drift and the positions of the debris field. >> david it certainly doesn't sound in this case like it is case of too much data, does it? >> not where we need it, right. again this comes down to the confidence of that last known position, that swath that we moved to that richard quest showed, has talked about moving up that arc. if we can be confident about that box as big as it is then we need to find ways to whittle that down. but if that's the box, and we believe the plane's in that box, we can find it and we should find it if it's in that box. >> david gallo, sylvan pascoe, thanks for being with us, talking this through. a lot more to discuss. up next we'll dig deeper into the troubling notion that flight 370 might not be found anytime soon or ever at all. we'll show you some legendary aviation mysteries, including many that remain mysteries even now. [ ambient street noise ] ♪