CNN CNN Newsroom With Carol Costello July 31, 2015 13:23:00
Ran out of fuel. and the test, of course, is how did it leave the air at that particular moment. so the numerous studies have been done about what happens when a plane does leave the air with fuel exhaustion. the traditional view is it doesn't go straight nose down. the traditional view is it glides and then goes into a bank and then spirals down. but we just don't know. >> well, you never know what this little piece of debris can tell us. evan perez has been reporting that investigators now think this plane was deliberately flown off course. do you believe that? >> yes, i do believe it was de...