Originally Posted by j2simpso

The cheapest fares (cited above) book into O class which earns 0% PQM and RDM. However, it's possible to pay $30-$50 more OW to get a fare which will earn valuable PQM. In addition, not everyone cares about earning PQMs on such flights if the end goal is to position yourself to a UA HUB like, say, LHR where you can purchase a ton of K fares and do a bunch of MRs ex-Europe to get off the PQM treadmill early this year.

-James