If the reports of an engine falling off are true, I'd truly doubt it. The Allah-lickers were conniving enough to figure out how to turn a box cutter into a weapon to take down a skyscraper. I don't see them being able to get the engine to fail just so, especially given heightened airport security. Plus, it doesn't seem spectacular enough. Not enough dead for their liking.
However, I have been wrong before. They learned enough to be able to fly the hijacked planes well enough; and maybe the fear that results from random acts against the air industry would alone provide incentive for the terrorists.
Great gum, by the way, although I can't say as much for your former baseball team…