ncl-jfk
The First class seats are not available to book even if paying full fare. Also some rows of economy seats are unavailable to book at any fare, there seems to be about 120 seats available to book on each flight.
It is possible that the seat map shown is not the final version and it has been used as a tempoary measure until the correct one is ready.
Have heard rumors that some AA aircraft will be configured in 188 seat all economy versions by next year (seat pitch 34 inches) This could be the answer?.