A passenger accommodation assembly for a transportation vehicle, comprising a plurality of accommodation units placed along an aisle with each accommodation unit being convertible between an upright seat position and a reclined position. A first accommodation unit of the assembly is elevated relative to a second unit whereby the legs of a passenger reclining in the second unit can extend under a seat portion of the first unit and the backrest of the passenger in the first unit can extend over the legs of the passenger in the second unit. Other embodiments of the invention comprise multiple accommodation units and combinations of accommodation unit assemblies.