[Butch Cassidy Slept Here]

In addition to Air Canada (Domestic/Canada rules), I read the rules for American, Continental and Delta. No airline specifically mentions the illness "Alzheimers," but rather uses the broader term of "mental handicap" or "mental illness." All airlines appear to, clearly, indicate an attendant MUST accompany such a person--and--there is NO discount. Continental's rules indicate when a gate agent, or flight attendant, determines someone needs an attendant to travel (because of a handicap/mental illness), and, that person disputes the need, then Continental will transport, without charge, the attendant (I guess, assuming an attendant is available.) As to people who are traveling with an attendant, AND, need a wheelchair: Air Canada has an interesting rule. Under Air Canada rules an Alzheimers patient would be classified as "non-self reliant," meaning--"A PERSON WHO IS NOT INDEPENDENT; IS NOT SELF-SUFFICIENT AND IS NOT CAPABLE OF TAKING CARE OF ALL PHYSICAL NEEDS DURING FLIGHT, AND WHO REQUIRES SPECIAL OR UNUSUAL ATTENTION" Seating, aboard any given aircraft is restricted, to a specific maximum number, for people in this classification who, also, use a wheelchair. Small Airbus aircraft, for example, are limited to TWO "non-self reliant" passengers, using wheelchairs, irrespective of accompanyment by an attendant. Finally, another rule limits Air Canada's liability for injuries in situations where said injury would not have occured in the absence of the passenger's physical or mental condition. In the US, Air Canada might have a hard time getting a court to uphold this last rule.