surface. an a-320 doesn't fly at 100 miles per hour. even at full flaps. it's the air the speed, you have to keep those constant. this plane was going too slowly for that altitude. we have all been if airplane in airplanes when it starts to get bumpy. he bleeds off speed to make that ride better. if this was either pile error, computer error, you get into that vertical instability up and down maybe they have icing on them as well all of a sudden we're talking about not one thing will bring down any one aircraft but you put all those three things together all of a sudden we have a problem. >> the pilot was talking there was very little margin dealing with speed at that altitude t. speed issue aside, david gal low, we should say you thread