Flights before 10am are "breakfast" and the flights after are "lunch/dinner." All the west coast flights will be the same style of service, with the alignment that happened Dec 1st. As mentioned, the storage space on the 321neo was driving this shift and it allowed an opportunity to streamline the service to the West Coast. JFK will still see the pseudo international style of service as before. The first round of service will be the buy on board cart, second round is the meal + drinks, third round is coffee/tea + sweet treat, last service is the Maui potato chips and Koloa rum punch. Hope that helps! Enjoy your flight.
In other words, HA has skimped on galley space on the A321 to cram in more seats.
