American Airlines continues to be negligent and abusive to disabled wheelchair passengers. On three separate, consecutive flights wheelchair service was not properly arranged even after diligently making requests. Furthermore, on a flight from Miami to Houston IAH the flight attendant disabled the call button so that this disabled medical passenger could not summon the attendants for assistance. The flight attendant admitted disabling the call buttons as they were ‘annoying’. The captain of the aircraft was advised of her action as he told me he would investigate. AA admitted some liability but offered no compensation to the painful forced walking of a recently hospitalized passenger who had a stroke and heart attack the very same month as the sorry excuse of air travel from American. American is not really sorry at all and just offering a casual ‘sorry’ is not sufficient.