Experienced AAdvantage members, hoping for a little guidance.

I am travelling ORD to LGA, and according to the online seat selection the 737 configuration has 30 rows and is this:
http://www.seatguru.com/airlines/Ame..._737-800_B.php

In this configruation, seat 9A looks good and I have selected it. However, is there a risk that the plane will be subsituted for the other 737 variant with no window? http://www.seatguru.com/airlines/Ame...ng_737-800.php

I have window seat options further down the back, but unfortunately not 9F or 10F that would be safe for both configurations.

Thanks for the consideration!

Cheers,
TIH