adjustable seats and components thereof are detailed . the seats , particularly useful in commercial aircraft , permit substantial angular recline without the corresponding rearward linear movement necessarily occurring in conventional seats . the seats additionally may have discontinuous , or non - integral , seat bottoms , with the heights of the forward portions of the bottoms being adjustable mechanically . tray tables optionally associated with the seats further omit any central slot and may define one or more pivot axes in locations different than exist in conventional seats .