lot more fuel than you would at cruise altitude. the difference you would recover is going to be very different than you would at cruise altitude. >> this is for tom, from michael, the last communication from mh-370 was spoken by the pilot. were all previous communication from him as well? >> we don't know that. >> why don't they tell us? >> i don't know why. most people say it really doesn't make a difference. the captain runs the ship. he could have said to the co-pilot, why don't you take off, i'll handle the radio. he had just been approved by his check pilot, essentially promoted into the position as a qualified pilot. he may have asked the co-pilot to fly and the captain took the radio all the way through. >> we would love to know who was doing most of the talking. if they release an audiotape so we can all hear it. it's not con fa deny chul or anything at this point. could deep silt in the wreckage