As of next week, the Acela First Class seatmaps are being changed to allow up to 20 window seats to be selected/occupied, vs. the current 16. This includes the dreaded Row 16, which is right against the galley and do not recline at all. One of the FC attendants told me that their rules allow one attendant to serve up to 20 passengers; above that, Amtrak must staff two attendants.