[Discombulator]

> If you're talking about the requirement to pre-fund their pension fund, my understanding is that UPS and FedEx (and all private corporations) were already required to do so.

It seems that most observers agree that this is not the case, so it is unclear how you came to the exact opposite understanding. E.g. https://www.bloomberg.com/opinion/articles/2018-04-04/congre... mentions

> The law requires the Postal Service, which receives no taxpayer subsidies, to prefund its retirees' health benefits up to the year 2056. This is a $5 billion per year cost; it is a requirement that no other entity, private or public, has to make.