Here is a post from I think the same statement you made in the past. Please list at least the most onerous work rule changes the Moakies brought you in the recovery from the bankruptcy.

In 2007 Delta’s cost per block hour for pilots was 470.00. In 2019 it was 1239.00. The 2019 cost was probably the highest pilot block hour cost at any airline world wide and did not include profit sharing which would have elevated us even higher. That’s the value of knocking out timely contracts that compound. You also have to understand the RLA and how it functions. It flat out blocks grand slams.
As to your assertion that other parts of the contract have been neglected the DC plan went from 9 to 16%. Sick leave went from 65 hours to 270. Reroute pay improved dramatically. Greenslips went from 150 to 200%. Restrictions on greenslips in months with training or vacation were removed. Reserve duty rigs were improved to match line holders. Reserve pay was increased from a flat 70 hours to a average of 76. We retained the best crew augmentation policies world wide while almost everyone else caved. We improved disability from 40 hours a month pay to 50%FAE including profit sharing and made it fully pensionable. We increased min layover times substantially. We added more reserve days off and obtained early release options. We added a average daily guarantee. We improved on duty guarantees after midnight. We added time limits for return to base on reroutes. We added a enhanced disability account. We increased vacation and training pay. Increased distributed training pay. The above is off the top of my head and probably about ⅓ of the improvements since bankruptcy. The work rule changes alone reduced our productivity 20% from 2007.