AA only runs three class (F and J with lie flat seats) A321-200s with Sharklets ("32B" on aa.cim, but unfortunately this includes three class "Sharklets" equipped aircraft - that do not fly this route) with 3 x 3 Economy seating.
I'd also bet that you will probably not be able to achieve your goal due to schedules realignments, high travel season and higher load factors.