pardon my semantics here, I am trying to understand this...

So, what you are saying is that in order to use a club, the outbound segment from the origin must be issued by that carrier? Irrespective of code share agreements?

EWR is a bad example because the P-Clubs and WC are in different terminals. But I can book the same EWR/MEM flight on NW or CO as a code-share. If I booked it on CO I could use the P-Club, but not the WC, and vice-versa for a NW flight #?

I would also assume that at the transfer hub like IAH, CLE, DTW, MEM, MSP that I could get into the WC or P-Club because at least one of my segments is on NW or CO, or does it have to be the outbound, etc?

this is kind of foolish, why don't they just have reciprocal NW/CO agreements? I can understand that I wouldn't get in w/ a DL, UA, AA ticket, but jeez... I can book the same flight w/ a different flight number and get denied entrance... hmmm... is this enforced or can you reason with the agents?

thank you for your reply...