[Polynikes]

Interesting theory. It certainly could be, but I lean more to an Occam's Razor solution. Airbus does have a history software troubles apparently because of incompatible software used at various manufacturing sites. If more planes start to drop then terrorism becomes more likely
http://www.businessweek.com/globalbiz/content/oct2006/gb20061005_846432.htm

[GeorgiaDawg32]

that could very well be..like I said, I’m thinking outside the box and my guess is as good as anyone elses.

[verga]

Up until 9/11 it was "unthinkable" that terrorists would take planes hostage to use as flying bombs.

It is only unthinkable until some one actually does it.