None of this is unique to Delta. Month after month of traffic reports shows most airlines reporting similar drops in traffic, yield, unit revenues, etc. There is not one airline that is an outlier either on the positive or negative side.

Every legacy carrier has reduced capacity this year and the aggressive LCCs that were originally intent on growing have either slowed their growth quite a bit or started to cut as well.

As for letting people go, virtually all legacy carriers have announced furloughs and redundancies on top of the volunteers that decided to take early-outs through special programs offered by carriers earlier in the year.
Delta actually has been just about the only legacy carrier that still has not involuntarily furloughed any front-line employee. The recent layoff announcement was for salaried management and admin staff, not front-line employees. CO has furloughed FAs and pilots this year, AS just announced furloughing of pilots, AA has furloughed FAs, etc.