Re: American's new 737-800 design changes??
This is not a new design change, it is the result of the location of the lavatory service port, which is at the rear of the A/C. The 737NG (-600-900ER ) uses a vacuum system which condenses all the waste to one tank, because of this a "blower" is required which is located near the L2 door. As a result of the location of both the blower and the service port, AA found that this is where a good part of the corrosion occurred. Also if you notice on any other A/C with a polished surface, where ever there is a lavatory service port it is typically painted grey.