Hi Everyone, there are two scenarios where someone could appear on both the Flight Standby list and the Upgrade Standby list. The first scenario is a paid First Class customer, who'll appear on the Flight Standby list (in priority order) and at or near the top of the Upgrade Standby list. The second scenario is a pass rider (a.k.a. non-rev) who'll appear at or near the bottom of both lists. In both cases, the traveler will be cleared into the main cabin if/when this is the only seat available and will remain on the Upgrade Standby list.