Customs in software is already a bit of a thing, judging from what postal tracking reports on occasion. I guess that doesn’t obviate the need for physical inspections, but it should make them faster.
Northwest = NO YUO!
Technically 22 other places are supposed to accept international mail, but in reality, the other 5% go through Newark (for some surface mail), Hawaii, Guam and American Samoa.
This creates some long detours.
https://www.uspsoig.gov/reports/audit-reports/international-...
Countries know goods must flow through certain choke points so they can essentially quality control the manifests.
Remove that and pre-authorised customs will go again.
My concern is around the space an airship takes up; coordinating traffic for maximum throughput is going to be a nightmare.