For a brief period pre-COVID UA had hot meals in E+ only; I don’t believe that has returned. However, on EWR-LAX/SFO flights operated by widebodies, UA is currently serving hot meals in Premium Plus- for now they’re the only ones selling Premium Economy on transcons, but it looks like both DL and AA will be entering that space in the next 1-2 years.

Currently, AA is offering a cold snack in Y on JFK-LAX/SFO (maybe SNA as well) and on BOS-LAX. The afternoon/evening service is along the lines of sandwich/wrap, fruit and cheese plate or veggie and hummus plate; don’t remember the breakfast options but it’s along those lines