Like a lot of people, I use FlightMemory/OpenFlights/FlightDiary. Before I started using them, I kept a spreadsheet. But I've been flying longer than I've been using spreadsheets, and even now, sometimes I forget to jot down a tail number or other useful information.

I know that, for example, UA's web site will tell me what ship number operated a flight today or yesterday (and where it came in from, and so on). But if I want to know what planes I was on EWR-DEN-LAX-ITO (UA 1643/235/1004) on June 23, 2013... I'm not sure if that's info I can find.

Far enough back, I might not even know what specific days I flew (although I'm pretty sure my Dad still has paper ticket receipts from PeoplExpress EWR-BTV in '84 or '85, so I could find out), and might just be wondering "hmm, what type was that airline using on that route in that year?"

Are there tools out there for getting that kind of historical info?

(And yes, I've looked at SPOTTERS and ACARSD - it looks like my flights are too far back.)