A couple of dynamics at work here. Like many places, SWA has had a pretty stagnant seniority movement since Age 65 went into effect so many senior FO's have been enjoying a great QOL for the past 5 years so there's no rush to jump to the bottom of the Captain list when they can make almost as much money and wait until their seniority can let them bypass commuting to sit reserve as a junior Captain. Another factor is the inbalance of east vs west seniority--almost 3 years between the most jr Captain on the west coast (spring 2004 hire) vs the most jr Captain on the east coast (summer 2001 hire).