Originally Posted by
6rugrats
Here is our experience. On a recent ORD-IAD-LHR trip, Mr. R used a SWU and was placed in F for the ORD-IAD leg and in C for the IAD-LHR leg.
Of course, there was no C class in the ORD-IAD leg.
Is that what you are asking about?
I believe the OP is asking if one leg1 is in Y and leg2 is in C, can an SWU be used to upgrade leg1 to C and leg2 to F
or something like that.