The dynamic seems to be changing daily. American announced it's agreement with ALPA pilots and it's pretty revealing. The uptake is that it's pretty clear AA doesn't see a return to normal anytime soon, and that their retirement offers may be contingent on equipment type flown, not just seniority.
That would mean the older 757/767 models would be retired, creating a large surplus of PAX aircraft that could be freighter conversions...at bargain prices. The operant theory is that the other major airlines would likely follow the lead of AA.
This is from an AA pilot YouTube blog (Juan Browne, blancolirio), on the retirements. The Amazon angle is mine, not his.
Amazon just announced they'd be hiring 100,000 additional workers, with probably more to come if the Covid-19 issue persists for a long time.