The　public　areas　of　airports　are　often　bustling,　raising　the　risk　of　infectious　diseases　spreading　through　fomites.　We　recorded　21.3　h　of　video　at　three　airports,　focusing　on　nine　common　areas　(e.g.,　boarding　and　check-in　areas)　where　people　touch　surfaces.　We　analyzed　25,925　touches　to　create　a　model　for　how　microbes　spread　from　surfaces　to　humans　through　touch.　The　airport　mask-wearing　rate　is　high　(96.1%　in　non-restaurant　areas),　but　it　is　lower　(22%)　in　restaurants.　Passengers　touch　their　mucous　membranes　more　often　(10.3　times/hour)　in　restaurants　compared　to　other　areas　(1.6　times/hour　on　average).　Wearing　a　mask　can　significantly　reduce　the　risk　of　obtaining　a　virus　through　direct　contact　with　hands　and　mucous　membranes.　If　everyone　in　non-restaurant　areas　wore　masks,　the　viral　intake　fraction　could　be　reduced　by　up　to　97.4%　compared　to　not　wearing　masks.　People　touch　public　surfaces　the　most　in　self-service　check-in　areas,　at　a　rate　of　473.5　times　per　hour.　Disinfecting　public　surfaces　or　hands　twice　per　hour　could　reduce　the　viral　intake　fraction　in　each　area　by　27.7%　or　15.4%,　respectively.　The　findings　of　this　study　provide　valuable　data　support　and　a　scientific　foundation　for　implementing　interventions　aimed　at　mitigating　fomite　transmission　within　airport　settings.　©　2023　by　the　authors.