This work illustrates the development of passive noise control (copyright) improvements of aircraft headrests to enhance the acoustic comfort for passengers. Two copyright improvements were studied with the aim of reducing the noise perceived by passengers during flight. Two headrest configurations. with and without the lateral caps. https://www.bekindtopets.com/mega-save-NHL-Florida-Panthers-Frozen-iPhone-13-Pro-MagSafe-Case-p93068-save-extra/