For those in the know...
Why is LAX 756 Captain so much more senior than LAX 737 Captain?

What I hear from from others is "essentially the same pay"... "West coast 757 flying is not near a good as the 737 flying"... "I'd rather go to Hawaii in the 737 than EWR in the 757 for the same pay"...etc....

While the aircraft certainly has a roomier cockpit and nice to fly (according to those that have), how does that account for such a steep difference in Captain seniority between the fleets?