more about viewer questions. this one is from kenneth, he says how could the plane be going faster yet the distance is not as far than first thought since we're told it was flying for seven hours? >> because there's a difference in the fuel burn. the fuel burn is what's determining how far we assume it has flown before it all ended. i think it's important for us to realize that those who want to use charts to determine this should be reminded that the charts are based on fuel at the tank at the end. and the event here may very well be dry tanks. that may be a different distance. >> clyde, what new questions does this new information about the plane speed bring into the equation? does this mean that flight 370 was flying at a higher altitude, as well? >> i think the most fascinating thing to me about this, i