Originally Posted by flyinryan
I would imagine your curiosity about the Y/B fares stems from a corporate travel policy of "coach-only?"
If so, don't forget about the QUAUP/YUAUP fares, which, when available, book into A (first class) but appear to be Q (coach) for just this purpose. Many of these fares are less expensive than a Y/B, are still fully changeable and refundable, and don't require an upgrade. They also earn the mileage bonus associated with A fares (150% EQM/RDM.)
All true, but a note of caution: Some (but not all) companies now look at fare BOOKING CLASS rather than FARE BASIS. This is a new trend to combat QUP's in general. NW's "B2C" fares are also "ruined" if your company does this.