It might be easier to comment appropriately if we actually knew what the OP was offered, the length and times of his/her flight.

Certainly today's environment allows for edible sandwiches, for example - kitchens producing sandwiches for some small restaurants / coffee shops and similar operations prepare these in sterile facilities at 36 F / 2 C, replace air with nitrogen and pack them in sealed packaging, for example, precisely so they will last several days if refrigerated.

I don't know if these are ubiquitous where AA flys, but they are certainly what state of the art provides and IMO AA could probably sell reasonably well during normal meal hours on longer flights (3 hours and up?) (Then again, though I know the facilities exist, perhaps AA has done surveys and market research that shows people might not buy them - much like people chose not to pay a cent more for "More Room Throughout Coach.")

B6 is a completely different animal - for instance, if AA had newer (needing less maintenance) and more fuel efficient aircraft than the 300 MD-80s, etc. they might be able to do more.