Abstract: The invention relates to an airframe having a substantially circular cross section in a lateral direction (Y) and which extends in the longitudinal direction (X). The airframe comprises, a plurality of rails for supporting seats, each rail being parallel to the longitudinal direction (X) of the airframe, a plurality of beams parallel to the rails; and a plurality of crossmembers aligned, in use, in the lateral direction (Y) of the airframe. Each crossmember supports only some of the successive rails, each crossmember being supported by only some of the successive beams in the lateral direction (Y) of the airframe with the beams forming part of a wing box and/or a main landing gear well of the airframe. Each crossmember comprises at least one connection to each of the beams that support it where each connection comprises at least one articulation about at least one axis.

Abstract: The invention relates to an airframe having a substantially circular cross section in a lateral direction (Y) and which extends in the longitudinal direction (X). The airframe comprises, a plurality of rails for supporting seats, each rail being parallel to the longitudinal direction (X) of the airframe, a plurality of beams parallel to the rails; and a plurality of crossmembers aligned, in use, in the lateral direction (Y) of the airframe. Each crossmember supports only some of the successive rails, each crossmember being supported by only some of the successive beams in the lateral direction (Y) of the airframe with the beams forming part of a wing box and/or a main landing gear well of the airframe. Each crossmember comprises at least one connection to each of the beams that support it where each connection comprises at least one articulation about at least one axis.