[Timshel]

A bit late to the party but the 100 backorders is in fact quite small if you consider they make 50 a year (as mentionned by another comment).

Even if it was possible to double the production for free in a year then without new orders when this come online you only have 50 orders left to process ...

If you look some plane production backorders are in the decade I believe atm. Looking at the A320 orders you can see how they ramp up production (and this ramp up might production line switching from aircraft type not new lines) : https://en.m.wikipedia.org/wiki/List_of_Airbus_A320neo_famil...