I found this on another media. Personally - this would seem to be a bad ruling and almost impossible to enforce.
A recent ruling by the Supreme Court of Canada states that some airline passengers can have two seats for the price of one. Citing a case involving Calgary lawyer Linda McKay-Panos, Canada's top court ruled that individuals whose obesity is caused by a medical condition can have to seats while paying one fare on domestic Canadian flights. The case stems from a 1997 Air Canada flight that resulted in bruising to McKay-Panos after she was forced to travel in a narrow bulkhead seat, says a Canadian Transportation Agency Spokesman.
In the end - who forced her fly? She chose this means of transportation.
USMCFLYR