American uses a dedicated sub-fleet of 3-cabin A321T planes with 20 lie-flat Flagship Business seats in a 2-2 configuration for these flights. JetBlue also has a sub-fleet of A321s featuring their Mint Business Class, which alternates between a 2-2 lie flat seats and 1-1 suites with a closing door. United and Delta use a combination of wide and narrow body aircraft for these routes, with a variety of lie-flat seat designs.