So what constitutes a connecting passenger?
Sally is flying from A to C via B. Segment A to B is on a CRJ. Sally places an upgrade for segment B to C. Segment B to C is waitlisted. Is Sally a connecting passenger?
Joe is flying from A to C via B. Segment A to B is on a 320. Joe places an upgrade for segment B to C, but not segment A to B. Segment B to C is waitlisted. Is Joe a connecting passenger?
Bob is flying A to C via B. Segment A to B is on a 320. Joe places an upgrade for segment A to B and segment B to C. Segment A to B clears, but segment B to C is waitlisted. Is Bob a connecting passenger?