>> reporter: hi,al "son, we have been getting bits and pieces of information all along him some of that information conflicting. so there has been plenty of confusion, plenty of questions, few, of course, actual answers. now, egyptian authorities have been tight lipped about this investigation. much has been coming from russian sources reporting that the tail of the plane was found some three piles away from the bulk of the wreckage found unburned. that's potentially significance. because in 2001, the same plane tail struck the runway in cairo and needed repairs. experts say those kinds of repairs, if done, incorrectly, could lead to problems years ago sometimes decades down the line. at the same time, airline officials were saying the plane was if pristine condition and it had passed all of its routine maintenance checks. egyptian officials are urging