Seating arrangements for seats configurable between an upright and lie-flat position are presented. A three-seat grouping can include a lower aft-facing seating assembly, an upper seating assembly, and a lower fore-facing seating assembly in which the lower seating assemblies underlap the upper seating assembly when in a lie-flat position. Lower seats can be aligned or angled with respect to an upper seat in a manner that conserves space. A six-seat grouping can include 3-seat groupings in which lower seats are aligned with upper seats, or are angled with respect to them. Support structures can be shared by adjacent seats. A six-seat grouping can be embodied as a hybrid arrangement in which footspace is narrower for a lower opposing seat than for a lower seat facing the same direction as an upper seat. In an example embodiment, footspace can be divided between an upper seat and a lower opposing seat.