of transporting people and whose operations affect commerce. (b) Construction For purposes of subsection (a), discrimination includes— (1) the imposition or application by an entity described in subsection (a) of eligibility criteria that screens out or tends to screen out an individual based on vaccination status or any class of individuals based on vaccination status from fully enjoying the specified public transportation services provided by the entity, unless such criteria can be shown to be necessary for the provision of the services being offered