Originally Posted by bdjohns1

FWIW, if you took/credited flights to United, Mileage Plus will give you a printed dump of all mileage-earning activity on your account going all the way back to the beginning of the program. (PM if you want details). It'll basically give you dates and flight numbers.

Since something like 90% of my airplane time has been on UA, that got my OpenFlights records pretty accurate. I know I'm missing some NW SYR-DTW-MEM legs back before Mrs. bdj and I got married and were doing the long-distance thing