The U.S. Department of Transportation operates a toll-free hotline to assist air travelers with disabilities [1].
1-800-778-4838 (voice) or 1-800-455-9880 (TTY)
The hotline is available Monday-Friday, from 7:00 a.m. to 5:00 p.m. (EST), except holidays. The hotline provides general information to consumers about the rights of air travelers with disabilities. It also assists air travelers with time-sensitive disability-related issues that need to be addressed in “real time.”
Any person believing that an air carrier has violated any provision of the ACAA rules may file a complaint [2] with the DOT.
Links:
[1] http://airconsumer.ost.dot.gov/hotline.htm
[2] http://airconsumer.ost.dot.gov/ACAAcomplaint.htm