I don't have any sources but anecdotally I would say that one of my packages has a status of "delayed"
It arrived in my state, about a 45 minute drive from me on Sunday, and it is not expected to arrive until Friday. presumable sitting in a warehouse in a queue of things to go out
I currently have multiple USPS packages (incoming and outgoing) that have statuses of "In Transit, Arriving Late" and have not been scanned for many days. One package was last updated 13 days ago. An acquaintance who sells things online is seeing the same thing, packages in transit with no updates for 1-2 weeks.
It's possible we've just been unlucky and these packages are lost, but it could also be indicative of a larger logistical problem with USPS.
I shipped a package from Chicago to Baltimore last month. Based on tracking info, the USPS had it on a truck within hours. To Wichita. It made it through the distribution center there and back on a truck within another few hours, where it showed up in Washington DC 6 days later. And now I guess it's heading to Baltimore. Or at least I hope so.
My daughter sends books via media mail to a friend in suburban NYC. For basically pocket change, they get there in 3 days or so.
It arrived in my state, about a 45 minute drive from me on Sunday, and it is not expected to arrive until Friday. presumable sitting in a warehouse in a queue of things to go out