I have observed the number of units (aircraft) produced of different models (Quantity produced in A/C info page) dances up and down. This seems strange, as once the metal is produced, it should be counted without further variation, no? I
ask this out of pure curiosity, as I cannot understand where the missing aircrafts go.
Example: Sukhoi Superjet 100-95 production showed 238 units in October, now stands in 218.