Rather ominously, I found this statement in the U.S Postal Service link Gracielle provided and could answer her question about Suspension Due to Unavailability of Transportation :Excellent find, AmigoArtistico. The USPS website posted by him shows Argentina to be in the category: Suspension Due to Unavailability of Transportation...updated May 14, 2020
Could that mean that flights from the US that normally bring mail have not been able to provide the service because EZE has been closed to commercial flights since ______(cannot remember date) ?
"There are probably thousands of cargo containers with mail spread all over the world sitting at airport facilities and transit stations waiting to be processed to their next destination.
It will likely take weeks (or months…?) for some mail pieces to move again once these operations resume and cargo capacity becomes available to continue the transit of the cargo containers."