Not sure that this anything more than a statement of the obvious...
The supply chain for a particular flight is a lot more complicated than say the supply chain for the manufacture of a steel beam for a construction project. There are so many variables even for one supply chain, let's say catering--for instance, what time of the day are you talking about. An AA flight from DFW-RNO at 10am will not have catering other than snacks and beverages boarded. A DFW-RNO flight departing at 1800 will have dinner trays catered for F/C in addition to the snacks and beverages.
Now given that, there is the load to consider. Not only must the caterer not "over-cater" those first class meals, they must also have meals available at a convenient location just in case there are unexpected last minute passengers in F/C. For instance, if the F/C confirmed load is 6 [out of 16 available seats] 24 hours out, the caterer's instructions may be to prepare load + 2 meals. However, if 6 highrollers walk up to the ticket counter one hour before departure, and are willing to pay full F/C fare to get on that 1800 flight, you can be assured that there will be meals catered for those passengers.
It's why meals tend to be the same at a given time of the year for a given class of service--and yes, there are different classes of service for F/C. The F/C meal for DFW-LGA is more elaborate than a F/C meal for DFW-RNO. Each day the caterer prepares x number of additional F/C meals for each class of service which are stored at a location in the airport terminal--usually the catering kitchen is too far away to provide last minute catering from there.
And, that ain't all. Early morning flights have milk--both skim and 2%--catered for coach. Flights the rest of the day, do not. And, that's only at AA. I don't know what other airlines do.
And, we haven't even checked your bags yet. Good luck with your project.
