Okay, being someone that works in the aviation industry, I'll chime in on Porcia's full scale comments:
American 767 in Chicago-THE ENGINE HAD A CATASTOPHIC FAILURE, it does happen. If you look at what causes that kind of failure, it's 99.995% of the time either a part that failed after not being caught as worn in a maintenance cycle, an unknown faulty part being installed during a maintenance cycle or INGESTING FOD!!!!!!! FOD, in this case, could be nothing more than a pebble or small stick blown onto the runway or dropped by a bird or, for that matter, a bird itself sucked into the engine, causing the front fan to turn into shrapnel, cutting through the wing and fuselage structures. Gee, isn't that the same kind of damage I said would happen by a quad going through an engine months ago? Just for the record, this was the same kind of damage as was found on the Australia Airlines Airbus 380 after it's left inboard Rolls Royce engine disintegrated in flight due to a faulty oil fitting and/or locating recess in the engine.
FEDEX MD10-10F in Fort Lauderdale-THE LEFT MAIN GEAR COLLAPSED DURING POST LANDING SLOW DOWN ROLLOUT. This means structural failure of either the landing gear strut or the pivot hinge structure in the wing. When you consider that the last MD-10 was completed and delivered in 1988, that means the plane has to be at least 29 years old. IF you figure at least 300 flight cycles per year, that's at least 8700 times that the main landing gear have had to absorb the impact(and yes, it is an impact) of 250,000+ pounds hitting the runway and then being torqued rearward as the brakes are applied. This was an "old age" failure, plain and simple.