Although the wiki page below is primarily directed at finding tail numbers, there are a number of resources listed that will provide you with historical flight information, including FlightStats and ExpertFlyer's Flight Status search.

http://www.flyerguide.com/wiki/index.php/Tail_Numbers_(AA)

There are a number of threads linked from the bottom of that wiki page that you should find useful. Among them is the main flightmemory.com thread in TravelBuzz:

http://www.flyertalk.com/forum/trave...emory-com.html (TravelBuzz thread)