Go back and read what I posted, please. This has nothing to do with normal Priority or Express delivery, so don't try to apply your experiences with those services to it - this is specific to the shipping of live animals via the USPS. It isn't that all, or even most, shipments would be delayed; but their stipulations for appropriate conditions can result in delays.
I'll be honest, I haven't looked through that stuff in a few years - it is possible that it has been revised/updated. As I said, I don't have time to search for where I found it; but I'm fairly certain that there was some discussion about it on this site.
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