Originally Posted by
crazeinc
The only upside to doing this is our SFO-NRT-TPE (and reverse) carried the same flight number and only required one miles + copay upgrade and it applied to both legs. ...
this would have been true even if two separate flight numbers -- only one "fee".
The downside is you could not waitlist just for SFO-NRT leg and if NRT-TPE only cleared, miles and co-pay still would have been charged (but usually just the reduced level).
No upside I can see.
Originally Posted by
crazeinc
... Not sure if that's also true when using a SWU.
SWUs on UA metal can be applied to multiple segments.