UA has done a host of changes to the TPE
station in the past few years.
Pre-2001, it was daily SFO
For some time after 9-11, it was downgauged to 772.
Then SARS hit in 2003 and there were no flights to TPE
for a couple of months then only to come back as the SFO
on a 772.
When traffic rebounded, SFO
was upgauged to 744.
started with 772, the LAX
route was flown with 772. Now the NRT
segment is an extension from either JFK
still flown with 772.