to 103 knots. >> we are now going to be looking at flight data recorder information to validate parameters, things like the auto throttles. >> reporter: but there is a speed indicator in the plane and they would also see it in bright red in white lights like on this simulation flight called precision path indicators or poppy lights. >> at 200 feet, he notices the four were red. >> reporter: the impact so violent that investigators say two attendants were ejected from the plane after the tail section broke off. >> i believe we ended up finding what we believe was four people in the back in the rubble. >> reporter: today for passengers arriving in san francisco, an eerie site, a sobering reminder of how so many