A mattress for use in aircraft includes a lying surface and a low-flammability foam core. The foam core has, on the side facing the lying surface, a large-area recess which occupies at least 70% of the lying surface. The recess is surrounded in the edge regions of the lying surface by a foam web and a lying base that includes a spacer textile that is inserted into the recess. The fibers of the spacer textile have low flammability. This mattress offers a high degree of comfort and at the same time fulfills requirements under aviation law as regards low flammability.