ITN Class Availability varies depending upon destination
 

I’ve been checking various flight options on ITN and was surprised to find that a flight’s available seats in a particular class change depending on the destination. It makes sense from a revenue management perspective, but it reduces the value of ITN for predicting upgrade/bump possibilities for us! :( Of course ITN is still useful, but now I check a few flights to be sure that I get a good idea of how full the flight really is!

(More seats available only to MSP)
12/23 NW1973 FAR-MSP...... P9 F9 Y9 B9 M9 H9 Q5 V5 L0 T0 K0
12/23 NW1973 FAR-MSP(-CVG) P9 F9 Y9 B1 M0 H0 Q0 V0 L0 T0 K0

(More seats available only to MSP)
12/23 NW3012 FAR-MSP...... Y9 B9 M9 H9 Q9 V9 L9 T9 K8
12/23 NW3012 FAR-MSP(-CVG) Y9 B0 M0 H0 Q0 V0 L0 T0 K0

(Less seats available to MSP in expensive classes more seats in cheap classes)
12/23 NW3004 ABR-MSP...... Y4 B3 M2 H2 Q2 V0 L0 T0 K0
12/23 NW3004 ABR-MSP(-ATL) Y7 B4 M2 H0 Q0 V0 L0 T0 K0
12/23 NW3004 ABR-MSP(-MCO) Y7 B5 M3 H0 Q0 V0 L0 T0 K0

segment logic
 

it is called segment logic and can be very frustrating esp in F class. Some seats are available only on one segment of a multi segment flight or only on the total fliight and not on either segment.

It could also be because part of a continuing flight is booked, but the other segments are not. If MSP-CVG is heavily booked, but FAR-MSP is not, then you might get the first set of results. If you combine the availablilty of FAR-MSP with MSP-CVG, then you should get basically the same results.

Unless segment logic is kicking in, which makes everything confusing.