While many airline crews want to blame franke, the fact is, that he opened up a new model of airline. However, the majors are ran poorly and choose to simply emulate the latest craze rather than change things.

In particular, AA, United, and Delta should be smarter and copy Midwest Express on base2base flying, only with twin aisles. Remove a column, a couple of rows, business class, and Give everybody comfortable seats. Then it is easy to fly high 90s% load factors.
Otoh, when doing single aisle, move it more towards spirit model. Pay for what u take.