Officials tell CNN there are new questions about Malaysia Airlines Flight 370's co-pilot's mobile phone.
His phone could be key in the investigation into the aircraft's disappearance
The Malaysian government is investigating whether his phone connected with other towers along the flight path - and why only the co-pilot's phone was detected.
How significant is this development? Is it just a coincidence or was something suspicious going on in that cockpit?
Watch Richard Quest and CNN aviation analyst Arthur Rosenberg's fiery debate over the latest developments in the investigation of missing Flight 370.