obviously came air. Situation for ships may not be as good. I did just get some tubes from Slovenia today. They came air also.
I have an amp on order from Kinki and it is supposed to ship in a few days. I believe they ship air also.
Now your trip from Nashville to Newark was likely Fedex ground which has been gastopodically slow for a year. I bought an amp from Europe that arrived in Nashville and still took over a week by ground. But that was faster than some of the other Fedex ground shipments I had late last year. Maybe things are getting better.