Need clarification on an intl-> intl connection on separate tickets. Considering Aerlineas Argentina flights to/from EZE while arriving and departing on BA/AA into GRU. As long as I have the onward boarding pass and no checked bags, I can transit at GRU without a visa. Is this correct? Connection timeas are 4-6 hours. What is the minimum safe connection time, 2 hours or more?