Was just checking Jet Blue for Novembers flights and they have extended their schedule thru 1/2022 with Mint service(their version of First Class) from JFK and EWR(Newark). About $1,800 round trip, but pretty much in line with United pricing. I attached a picture of the seating arrangement.
I would guess that it is related to their alliance since they both now have flights available up to 1/25 - 331 days from today which is American’s standard.