Hi,
Last fall I flew one-way with AA from Boston-LHR on a student ticket bought with STA travel. I want to now book a one-way ticket back to Boston and found the optimal fare via studentuniverse.com.

However, in order for studentuniverse to issue me this one way ticket, they want the 13-digit ticket number of my original ticket. The original ticket was as e-ticket and I recieved an oversized boarding pass by AA which I tossed after my trip when cleaning the documents (I usually retain all my boarding pass reciets).

I called STA travel and they said they do not keep records for longer than 6-months. All I have as confirmation of my trip is:
1) My original purchase email that has a 6-digit reservation locator.
2) The credit card statement for STA travel that has the charge (but no 16-digit ticket number)
3) AAdvantage account which logged the FF miles for this trip.

The ticket student universe offers is by far the cheapest to other alternatives. Does anyone have any idea how I can find this information?

Kind regards,
George