look at the black box. still plenty of time left until it s going to be gone about 24 days left on the batteries. but you know they have to be watching that as they fight the elements and the water and all that uncertainty out there. tom foreman thank you so much. in addition to the urgent task of recovering the passengers who are still missing, investigators are of course racing to find the flight s black boxes, as tom just referenced. officials need these recorders to determine what exactly happened to airasia 8501 and to try to prevent it from happening again. to get their insights on the next steps, let s bring in david soucie and les oben. seems the prevalent theory is the plane stalled in midair. we don t have a definitive answer as to what happened but that s what a lot of experts think is most likely. what does that mean stalling, and how common is it? well it s very uncommon, especially in a jet airliner. but stalling basically means