This route is using Boeing 777-200 aircraft right now so all business class seats should be lie flat. For example today's Flight 7 is using aircraft N799AN, which is a 777-200 with 37 B/E Aerospace Lie Flat business class seats. These seats are new (within last 18 months) and generally preferred over the previous generation of Zodiak lie flat seats, although the two are fairly comparable.
You should confirm that the aircraft currently assigned for the your exact travel dates is a 777-200. As long as it is a 777-200 (772 in AA coding) you will get a lie flat seat in business class as American has completed the retrofit of all 777-200s.