The 737 flying is some of the best in the company. That is why it goes so senior. Lots of turns to the islands, and I have not seen a trip with more than four legs on it. (I am sure someone will point out one that does) Most are one and two leg days that take you from one great layover to the next.
The 757 has become the 88 out of ATL. You should see how many five leg days we have that go in to a nine hour overnight.