an alternate airport to use in case of emergency. what was flight 370's alternate airport and could that have affected the flight course? mary? >> the alternate airport has to be an airport kind of near where you are going. in other words, if beijing had an emergency or you couldn't land. the alternate airport is where you would land near beijing if you don't couldn't get in though airport. it shouldn't have affected the flight or caused the flight to go on the path that it did. every flight has to have it and they have to have an alternate airport for their flight plan and enough fuel to get to that alternate airport and 10% beyond that. i don't think it would have caused the vast deviation. don, there's something i did. i pulled up the list of the debris. there is a similar crash of a 737. we are wondering why there was no debris. in that case they couldn't find the plane a month. they put out a reward for debris.