The idea of putting the disabled at the back is not a good solution. The flight attendants usually sit in the front. If you put a handicapped person in the back and there is an emergency to exit the aircraft the flight attendants are around at the front to help them off. If they are in the back it may spell disaster.. Putting restrictions as to where they can sit is put in place. (No exit rows). Some people may be taking advantage of the pre boarding rule I agree but in my experiance (and I do fly a lot) I do not see that many taking advantage. I even have friends who can claim a "Medical" issue and they prefer boarding with the normal group because they do not want to be "pointed at".
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