; (2) make reasonable modifications in policies, practices, or procedures, when such modifications are necessary to afford goods, services, facilities, privileges, advantages, accommodations, or other opportunities to individuals with disabilities, unless the air carrier can demonstrate that making such modifications would fundamentally alter the nature of the goods, services, facilities, privileges, advantages, accommodations, or other opportunities; (3) take such measures as may be necessary to ensure that no individual with a disability is excluded, denied services, segregated, or otherwise treated differently from other individuals because of the absence of auxiliary aids or services, unless the air carrier can demonstrate that taking such measures would— (A) fundamentally alter the nature of a good, service, facility, privilege, advantage, accommodation, or other opportunity being offered; or (B) result in an undue burden to the air carrier; and (4) (A) remove architectural barriers to equal access by individuals with disabilities to goods, services, facilities, privileges, advantages, accommodations, or other opportunities provided by the air carrier, and communication barriers to such access that are structural in nature, in facilities of the air carrier (whether owned or leased by the air carrier) that were constructed before or altered after the date of the enactment of the Air Carrier Access Amendments Act of 2017 , and remove barriers to such access in aircraft manufactured before such date of enactment and used by an air carrier for transporting individuals, if the removal of such barriers is readily achievable