now the pilot made the last announcement the last radio contact. then it s the airplane supposedly went around air space of indonesia. we re getting this left and right. we have to sort those things out. the words on the cockpit voice recorders. if they pilots were incapacitated or died before the end of the flight at it one thing, but if a pilot was ditching the plane into the ocean as the flight ended, that quite another. the only problem with the voice recorder, if it copies over every two hours, that first event that took place may be gone. the first part of it. but is it your sense that from what we re hearing now, five different sets of pings, is it your sense they though the general area now and they know the general area? there s nothing necessary the that would make an electronic ping. there s nothing the. at it the middle of nowhere. so they re probably picking it
this is what it sounds like. do you hear that? that s the electronic ping, it s not really audible, human ears can t pick it up. of course there s a catch to this. battery pingers may have only days or hours left. which apparently is a game-changer once that happens. if they can find something in the next 24 to 48 hours. joining us from london, alastair is here with us. good to have you here. a senior u.s. official tells cnn, actually, our pamela brown, that investigators have discovered that they programmed alternate routes and searched what to do in flight emergencies, and they called that curious. is it curious that a pilot, a captain, would do that, or is that just due diligence.
sierra s cellphone in a field a few miles away from her home in morgan hill, california. 25 miles south of san jose in santa clara county. police found the phone sunday by tracking its electronic ping. investigators scoured creek beds, fields, all of that overt weekend for any clues into her disappearance. search dogs by the way apparently lost her scent at the edge of her driveway. family and friends are hopeful that she is still alive and they say she would not have runaway. i talked to her, said goodbye and gave her a hug and things were good. and i told her i loved her. i can t believe that she would not contact her friends and let them know that she is okay and do this. she would never want us to go through all this pain. come home, baby. please come home. you re not in trouble. everyone dar dar everyon everyone wants to see you. reporter: a desperate mom and dad.