; or (B) if the air carrier can demonstrate that the removal of a barrier described in subparagraph (A) is not readily achievable, make such goods, services, facilities, privileges, advantages, accommodations, or other opportunities available through alternative methods that are readily achievable. (d) Complaints (1) In general The Secretary of Transportation shall ensure that individuals with disabilities traveling in air transportation are able— (A) to file complaints with the Department of Transportation in response to disability-related discrimination prohibited under this section or regulations prescribed under this section; and (B) to receive assistance from the Department through a toll-free hotline telephone number or comparable electronic means of communication. (2) Notice to passengers with disabilities Each air carrier shall include on its publicly available Internet website, any related mobile device application, and online service— (A) the hotline telephone number established under section 42302 or the telephone number for the Aviation Consumer Protection Division of the Department of Transportation and the Department’s disability assistance hotline telephone number or a comparable electronic means of communication; (B) notice that a consumer can file a disability-related complaint with the Aviation Consumer Protection Division; (C) an active link to the Internet website of the Aviation Consumer Protection Division for a consumer to file a disability-related complaint; and (D) notice that the consumer can file a disability-related complaint with the air carrier and the process and any timelines for filing such a complaint. (3) Investigation of complaints (A) In general The Secretary shall— (i) investigate each complaint of a violation of this section or a regulation prescribed under this section