14 CFR Part 382 Nondiscrimination on the Basis of Disability in Air Travel (Air Carrier Access Act) (with amendments issued through May 2016)

(iii) You must assign a seat meeting the requirements of this section to a passenger with a disability listed in §382.81 of this part who requests the accommodation at the time the passenger makes the request. You may require such a passenger to check in and request the seating accommodation at least one hour before the standard check-in time for the flight. If all designated priority seats that would accommodate the passenger have been assigned to other passengers, you must reassign the seats of the other passengers as needed to provide the requested accommodation.