say, number one, you know there's only one 777 missing in this section of the world. if this is indeed the 777, i guess it begs the question, well, if it's not mh370, what other aircraft would it be? >> the clues are adding up that this is the real deal. we'll wait for the official word. families and friends of mh370, passengers and crew, they have wondered for more than a year what happened to their loved ones. sar ra spoke with "ac 360"s anderson cooper. she explained what it would mean to her if the wreckage proves to be from flight 370. >> if, ultimately, this is a piece of the wing, then that little thread of hope i have been holding on to will have to break. and reality will have to take over. but, yeah, up until now, i and most of the family members continued to believe that until