Which aspect of disability services is NOT mandated by the ACAA?

The correct choice highlights that the Air Carrier Access Act (ACAA) does not require airlines to transport emotional support animals. Under the ACAA, passengers with disabilities are entitled to certain accommodations that ensure equal access to air travel, including specific provisions for service animals. Service animals are recognized as trained animals that assist individuals with disabilities, primarily relating to physical mobility.

However, emotional support animals, which provide comfort rather than perform specific tasks related to a person's disability, do not receive the same protections or mandates under the ACAA. While airlines may choose to allow emotional support animals, they are not legally required to do so, unlike the requirements established for service dogs.

The other aspects listed, such as air transport for service dogs, seating accommodations, and boarding assistance, are all mandated by the ACAA and must be adhered to by airlines to ensure compliance with regulations that support passengers with disabilities.