Thinking of doing a trip from SEA - FAI - OGG/KOA - SEA (aurora and beach!); would like to use the companion fare.

Some of the trips that go from FAI --> OGG go back via Seattle. Does that make the routing invalid for the companion fare?

The other alternatives might have us connecting in ANC twice, but I don't think that's an issue for routing for an interim stop according to what I've found on the interwebs.