Originally Posted by YEG Guy

Correct if the gate agents do their job properly, the above order of list clearance will occur.

However if the agents are not aware of the J sby pax, they can clear the upgrade list before the j sby list and have all seats taken by upgrades. This can be simple oversight by the gate agent if they are not expecting a J sby pax as this type of pax is usually cleared at checkin.

Overall if a pax holds a J SBY BP card they should present themselves to the GA and advise that they are revenue J SBY pax.

J SBY pax are most often non-rev passengers hold C1/J10 or deadhead Captains. Crew members are picked out by their uniform. C1/J10 pax list is cleared after upgrades (IIRC).