Originally Posted by Transpacificflyer

Catering can be done in house but it would be an expensive option for Air Canada and would increase operating costs. Western airlines outsource catering to reduce their costs and to increase operational flexibility.
The "person" ordering the meals will most certainly know that there is a two cabin configuration because the flight will have been subject to planning months in advance. An airline doesn't just add a route willy nilly. The preparation will have involved a review from the onboard experience group and this includes a review of catering needs.
On any given day there will be delays or changes or swaps and the contractors are prepared. There are "contingency" snack/meals prepared that the caterer can rush into place on an aircraft on short notice.