How many plane parts were found on 9/11?
Many plane parts were found on 9/11.
Now, tell us about the crashes of commercial airliners where the identity of the plane involved was in doubt. Surely there must be at least one such crash, or else you and your fellow frauds have been blowing smoke about the significance of serial-numbered parts.
Tell us when serial numbers were required to establish what flight had crashed.
You can do that, can't you?