TSA
http://ww.tsa.gov/travlers/index.shtm

Federal Aviation Administration
http://www.faa.gov/passengers/passengers_disabilities/

U. S. State Department
http://travel.state.gov/travel/tips/tips_1232.html

DisabilityInfo.gov (Great resources for travelers with disabilities)
http://www.disabilityinfo.gov/digov-public/public/DisplayPage.do?parentFolderId=5120

State of California Visitor Information
http://www.ca.gov/tabpanel_visiting.html

California Disabled Placard
http://www.dmv.ca.gov/pubs/brochures/fast_facts/ffvr07.htm

California Department of Motor Vehicles
http://www.dmv.ca.gov/dl/disabled_info.htm

California DISABLED DISCOUNT PASS APPLICATION 
The Disabled Discount Pass entitles its bearer to a 50% discount for use of all base facilities (including day use parking, camping, and boat/day use parking…
http://www.parks.ca.gov/pages/737/files/DPR818a.pdf

City of Los Angeles Department on Disability
http://www.lacity.org/dod/dodcs1.htm