CNN Chicagoland April 6, 2014 00:03:00
Aviation correspondent, i should say, richard quest. are you happy now that i said 777? >> very happy. >> earlier he said, stop saying 777, say triple 7. first question from mark. is it possible what the chinese heard could be a submarine? michael, go. >> i don't think it could be a submarine. i think there's lots of background choice. i think it could be something natural. it doesn't have a hitter. the hydroplane doesn't have a filter on it. it's incredibly difficult to know what it is. submarine, probably not. >> okay. david, how does ocean currents, tides and weather impact listening for th...
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