>> reporter: in these kind of investigations, especially here in russia, especially with what we've been seeing, when they start they always say all options are open. that said, no one's really said they're going to pursue a serious terrorism lead. it really seems on so far that it becomes the weather. obviously they have to look at the black box and everything else but it doesn't seem to be going in that direction. >> do we know anything about the pilot's communications? i'd just suggest the weather channel with which we are affiliated has posted some information about the weather conditions at the time. heavy fog, visibility near zero, temperature 34 degrees, dew point 34 degrees, winds should not have been a factor, they were merely coming out of the southeast 5 to 10 miles per hour. but that visibility point is very disturbing. do we know if there was discussion from the pilot about perhaps rerouting? landingi inin inin ining elsewh?