I posted a thread on this a few years ago, but I want to know if anyone can tell me how to find registrations of planes for INTERNATIONAL flights that took place years ago. I say international because I am well aware that I can find domestic flight registrations on the BTS website.

Specifically, I want to find registrations for two United flights I took back in July 2001 (10 years ago) on the B777 between IAD and AMS (UA946/947). I flew from IAD to AMS on July 11, 2001 and returned on July 21, 2001.

Anyone know where to look? Thanks in advance!

KLM777300ER