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

(b) You must provide an adjoining seat for a person assisting a passenger with a disability in the following circumstances:

(1) When a passenger with a disability is traveling with a personal care attendant who will be performing a function for the individual during the flight that airline personnel are not required to perform (e.g., assistance with eating);

(2) When a passenger with a vision impairment is traveling with a reader/assistant who will be performing functions for the individual during the flight;

(3) When a passenger with a hearing impairment is traveling with an interpreter who will be performing functions for the individual during the flight; or

(4) When you require a passenger to travel with a safety assistant (see §382.29).