http://www.acarsd.org/fleetlist.html and also their search at
http://www.acarsd.org/acars_search.html sometimes helps.
I looked for AA0008 (that is the format) which I was on last week and it only lists that flight thru early October. Some AA flights are listed daily (I used HNL as a Route Contains option) while others seem to be delayed.
Good luck.
BTW . . this came from searching here for 'Tail Number' in the search feature....