This isn't a "Mint" configured A321, this is a "all core" (all economy) A321 which seats to about 190 pax. "Mint" is configured up to @165 or so. 16 Mint, 140 in the back. They use the All core A321's for high density routes, ie
JFK-
SJU/
FLL/
SDQ/
AUA/
BGI/NAS/
LAS to name a few off the top of my head. Right now they have @7 Mint A321 for
LAX, going to go upto 11 when
SFO Mint service starts in a couple months, and about another 7 or so all core A321's doing high density routes from NYC. In short the Mint A321 is a seperate dedicated fleet of @11 or 12 they will use specifically for
JFK-
LAX/
SFO..(For now..rumor is they will start Mint for Transcon
LAX/
SFO from Boston soon as well.)