United States Air Travel Regulations and Guidance for People with Disabilities

The Air Carrier Access Act (ACAA) is a law that makes it illegal for airlines to discriminate against passengers because of their disability. Airlines must accommodate the needs of air travelers with disabilities. 
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49 US Code § 41705.   Discrimination against handicapped individuals

An Overview of the Air Carrier Access Act  - Legal E-Bulletin- May 2009

Air Carrier Access Act (ACAA) Title 14: Aeronautics and Space, Chapter II, Subchapter D 

PART 382—NONDISCRIMINATION ON THE BASIS OF DISABILITY IN AIR TRAVEL

Guide: Air Travelers with Developmental Disabilities

Guide to the Air Carrier Access Act (ACAA) and its implementing regulations, 14 CFR Part 382 
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U.S. Department of Transportation's Office of Aviation Consumer Protection