Wednesday May 9th, I expedited a package from Amsterdam (Netherlands) to Pittsburgh, PA (USA) and already on Monday May 14th, my swapping partner confirmed its arrival! That's 4 working days

Sometimes good old snail mail can go fast as lightning!
Unfortunately, the package intended for me took two months to reach me, in which time it got returned to sender (apparently, some mail employee

along the way reinterpreted it as a Cash-on-Delivery package, which it obviously wasn't) and it had to be expedited a second time. My swapping partner was not to blame in this. In the second attempt, the package reached me in a week (6 working days), without issues.