FWIW, the DAL and NWA release "packages" were formatted differently and contained different slices of information.

The NWA "release" contained the important stuff: release no, ship no, route, MEL info, alternate info, fuel planning block (NWA used the expected fuel on arrival method). It was pretty handy for both pilots to have. The "acknologement" was just a 3rd copy that was signed and left.

The NWA "flight plan" only contained the "howgozit" portion that we know today. No need for more than one copy of that.

Nu