In response to an email from AA I checked my name as listed in their records and added my gender and DOB. I use a suffix (III) on both my Drivers License and Passport and the instructions on the Secure Flight section of the AA website stated that you had to either email or call to add that. I called and was told there actually was no field for a suffix in spite of the examples shown in the instructions.

Obviously still trying to work out the bugs on this one.