...They go to Ezeiza airport and get on a plane.
Perhaps the question is where are Argentine nationals allowed to enter? Not many places unless they have the right visa. Most countries in the world still have closed or heavily restricted borders to all foreigners.
For Schengen-Zone Europe they need to have residency or be married to an EU citizen for example. For Non-Schengen zone countries like Croatia it is possible to enter but it’s a long way to go to vacation in Croatia only.