Which requirement is NOT stipulated by the ACAA?

The Air Carrier Access Act (ACAA) outlines various requirements that airlines must adhere to in order to provide equitable access to individuals with disabilities. While options A, C, and D are explicitly included in the ACAA stipulations, the provision regarding "offering refunds for missed flights" is not a requirement mandated by the Act.

The ACAA focuses primarily on ensuring that carriers make their services accessible to passengers with disabilities. This includes the obligation to provide appropriate seating arrangements based on disability, adapting boarding processes to accommodate those with mobility issues, and allowing service animals onboard flights to assist passengers with disabilities. However, issues related to flight refunds, including those related to missed flights, fall under general airline policies and consumer protections but are not specifically addressed by the ACAA. Thus, option B correctly identifies a requirement that is not stipulated by the ACAA.