What must airlines do regarding accessible seating for passengers with disabilities?

The requirement for airlines to ensure a sufficient number of accessible seats is grounded in the provisions of the Air Carrier Access Act (ACAA). This regulation mandates that airlines make air travel accessible to individuals with disabilities, which includes having an adequate number of seats that accommodate those who require accessibility features.

These seats are usually located in areas where passengers can easily access and move in and out of their assigned area, taking into consideration physical limitations that may affect a passenger's boarding and deplaning process. Ensuring a sufficient number of these seats is crucial for providing equal access to air travel for all individuals, including those with mobility impairments.

The other choices pertain to specific limitations or offerings that don't align with the ACAA's intent. For instance, offering only the lowest fare seats would limit access instead of enhancing it, providing first-class seats at no additional cost is not a standard requirement, and limiting accessible seating to certain flights could potentially violate the provisions promoting equal access across all services.