A Netflix fan reader wrote me with an interesting theory. The idea is that if Netflix has a mail drop near a USPS "sectional center facility," then they will process mail on holidays and weekends. I think that this is partly true. I believe it works this way: every morning, Netflix brings an empty truck to the USPS and exchanges it for a full truck which the UPSPS filled up the night before, so even on holidays, Netflix can pick up a full truck and process it. Each evening, Netflix drops off the full truck of outgoing mail at the USPS distribution center, and the USPS works through the night, so that it is ready to be delivered to your home the next day.
This reader thinks that, if you live near an SCF, your Netflix discs are processed faster than if you do not. I have posted the list of Netflix distribution centers with the nearby sectional center facilities indicated, if you would like to test this theory.