14 CFR § 382.111 - What services must carriers provide to passengers with a disability on board the aircraft?
As a carrier, you must provide services within the aircraft cabin as requested by or on behalf of passengers with a disability, or when offered by carrier personnel and accepted by passengers with a disability, as follows:
(a) Assistance in moving to and from seats, as part of the enplaning and deplaning processes;
(b) Assistance in preparation for eating, such as opening packages and identifying food;
(c) If there is an on-board wheelchair on the aircraft, assistance with the use of the on-board wheelchair to enable the person to move to and from a lavatory;
(d) Assistance to a semi-ambulatory person in moving to and from the lavatory, not involving lifting or carrying the person; or
(e) Assistance in stowing and retrieving carry-on items, including mobility aids and other assistive devices stowed in the cabin (see also 382.91(d)). To receive such assistance, the passenger must self-identify as being an individual with a disability needing the assistance.
(f) Effective communication with passengers who have vision impairments or who are deaf or hard-of-hearing, so that these passengers have prompt access to information the carrier provides to other passengers (e.g. weather, on-board services, flight delays, connecting gates at the next airport).