Seeing the vast amount of wisdom on these forums, I just wanted to double check something...

Recently I purchased two UA metal RT's from BOS<-stopover->NRT from www.studentuniverse.com. According to studentuniverse, the flights should not count for FF mileage. However, I noticed that the Fare basis in one instance is WKWSTU / WKXSTU, and in another instance, TWSTUSP, TXSTUSP. I notice the "STU" in both fares, but that doesn't stop them from being normal eligible W and T economy fares right?

Last year I was able to credit one such return flight to AC, so I can't see why it shouldn't work with UA (I'm also getting my AC E comped to UA 1P). Just in case UA doesn't take them though, I'm prepared to credit those flights to AC. Any insights before I commit to this switch?

Thanks!