Correcto....#6 will definitely have to go through immigration and customs, and then recheck in for the bags.....I do not understand anyone considering cutting things so close, especially when immigrations and customs is involved.

Even if you fly in and out of Aeroparque, you need a minimum of 4 hours connection time minimum to be mildly safe, considering possible arrival and in-airport delays.

Factor in an EZE/Aeroparue combination, at least 6 hours (more for an international flight out), or an overnight in BA. You aint in Kansas anymore Todo.