I do not understand anything about the international mail this year! Although Boris suggested some ideas which might be legit. He says that the international mail is most likely sorted in the local post office right away. Then if there is not that much mail to a specific destination, they might wait longer (to fill a container?) before sending it to the distribution center. It makes sense, and it explains a lot. But now, all of my eight international parcels mailed on the same day are at different stages of their travel.
The parcel to the UK was delivered on Monday. The parcel to Germany arrived on Tuesday, but it was not delivered since a person was not at home. The parcel to Ireland just left ORD yesterday. The parcel to New Zealand was sent to New York (?!), and today it was in Japan (?!). Others either didn’t leave the US yet, or their movements were not reported.
Waiting for the updates:)