The plane had been flying at an altitude of 35,000ft (10,700m) and the pilots had not reported any problems with the aircraft, Fuad Sharuji, Malaysian Airlines' vice-president of operations control, told CNN.
Src:BBC
Mid flight even a small structural failure might prove catastrophic. Perhaps to the extent gforces would prevent the crew from issuing a mayday or even total destruction in a small timeframe.
Apparently the same plane was involved in a ground collision damaging a wing tip. Could be something or nothing.
Src:BBC
Mid flight even a small structural failure might prove catastrophic. Perhaps to the extent gforces would prevent the crew from issuing a mayday or even total destruction in a small timeframe.
Apparently the same plane was involved in a ground collision damaging a wing tip. Could be something or nothing.

. Current theories are about an Italian who was listed as boarding but has phoned his parents to say he wasn't on it (he lost his passport in 2013 so who was it that boarded?), and a Chinese passenger who is possibly linked to the Islamic terror attack in China a few weeks ago.