The main reason I am done with WN is the lack of interlining agreements. Prior to AS's intra-California increase (and transcons, Hawaii) in service options out of SAN, I earned A-list status most every year. While doing my best to avoid SFO whenever possible, there are situations when there are no practical options. During the all too frequent WX cancellations, the gate agent made "good luck getting to your destination", refund instruction announcements, rather than help passengers get to their destination with limited disruption. This is one of the primary reasons why I remain loyal to a major carrier, even if it means spending a few extra $$ to do so. When AS is not an option, AA continues to earn my business (LT Platinum), for the same reason; between the 2, I can generally find competitive fares, with reasonable routing, most anywhere in the world (exception is LAS, of all places).