call was made, what the plane was doing at that precise point, it is all information that is so pertinent to the investigation here right now. christine? >> it really is. and you have to wonder if other passengers on board may have had a cell phone that was on in their bag, in their pocket. i mean, certainly not everyone turns it completely off when a plane takes off. if there was some sort of trouble, could there have been more communication with other phones with that cell phone tower? i'm sure, i'm sure investigators are going to be looking at that. >> reporter: certainly, that's something for them to look at, and there were 239 people on board that aircraft. some people perhaps had more than one phone, phones registered in china, in malaysia, in other different countries as well. so, there's a lot of phone records to go through, and potentially, quite a number of cell phone towers that the aircraft may have passed over at a low altitude. so, a lot of very technical, very specific data-checking to be done by malaysian authorities here, and of course, a number of