A- FLOOR,
Regarding why you don't see other carriers with bits missing from them.(and other things going wrong)
They do happen, and often.I was in LUX about 1 year ago and as CargoLux pushed back one main gear wheel seperated on the axle,no one's fault im sure just a floor in the material the axle was made from.Just imagine if that had fallen off over the town ? God help anyone hit by that ammount of weight !.
Lufthansa- just wrote off a 743 in the hangar by not following up the locking rings on the main jacks,they pivoted the whole aircraft on the tail steady and the nose, went to lunch and "wow , why has the fuselage got an 18 inch joggle in it ?)
CAL,- nose gear retraction in LGG.
Air Canada,- tipped the aircraft on it's arse.
You just need where to look !
Cheers .