down. malaysian airlines confirming they lost contact with the flight over ukraine some time ago. david, i want to bring you in again. i asked you this question before but wonder if we can get more elaboration about what is standard operating procedure about flying over these conflict zones? >> well, the primary thing is that the identification of the aircraft has to be completely clear and when it is, it should not be involved in the conflict in any way whatsoever because of its altitude, where it's operating, it shouldn't be confused as a cargo plane, confused as anything else, because of the fact that its identification. remember, that identification comes from the transponder and the transponder is the same thing we had troubles with mh-370 when it went off. i'm not trying to say it's the same problem because we have no information that says that at this point. but we need to be cognizant of the fact that is the way even military radar can identify that