I think there's a website (flightradar maybe) that can assist, but I think the free one only goes back like 5 days.

Anyway:
Booked an award ticket last May (May 2019) for May 2020.
Wanted the 747, but got the 77w anyway (that's fine).

Alerted today that it changed to 747 (yay). haha

I know that it's still 6 months out and there's probably a good chance of changing again (fortunately KE has good email notification apparently).
Just curious as to how often KE changes aircraft on that route (I know it's "slow time" for them vs. more frequent travel).