Abstract: An aircraft is provided including oppositely opposed inner and outer skins. The outer skin, when subject to an impact, is movable towards the inner skin. The outer skin includes stiffeners that project into a cavity defined by a clearance located between the inner and outer skins. The inner skin includes stiffeners that project into the cavity towards the outer skin. The outer skin contacts the stiffeners when the outer skin is flexed inwardly rather than the stiffeners on the outer skin contacting the inner skin. The inner skin includes a noise abatement portion.