I can think of about two dozen reasons why an airplane might break up in flight. Assuming, of course, that in the absence of anything other than reports from notoriously ignorant and inaccurate news reporting agencies that an inflight breakup actually occurred.
I will give more credence to a midair being the only possible explanation when the other aircraft involved, or its wreckage, turns up.
Last edited by BobnSpike; 8th Jun 2012 at 20:08.