Aerosol-generating article

An aerosol-generating article for an aerosol-generating device, the aerosol-generating article comprising:

• a substantially planar upper surface and a substantially planar lower surface, the substantially planar upper surface and the substantially planar lower surface being vertically spaced from each other by a height defined in a z direction;
• a wrapper and an aerosol-forming substrate, the wrapper being arranged over the substantially planar upper surface and the substantially planar lower surface to at least partially encircle the aerosol-forming substrate and form an exterior surface of the aerosol-generating article;
• and
• a planar frame positioned between an upper layer and a lower layer, the substantially planar upper surface defining an external surface of the upper layer and the substantially planar lower surface defining an external surface of the lower layer, the planar frame defining a cavity,
• wherein an air flow path is defined through the aerosol-generating article in an x/y plane, the air flow path extending through the cavity.