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

(c) You must ensure that these movable aisle armrests are provided proportionately in all classes of service in the cabin. For example, if 80 percent of the aisle seats in which passengers with mobility impairments may sit are in coach, and 20 percent are in first class, then 80 percent of the movable aisle armrests must be in coach, with 20 percent in first class.